Add file creation logic
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@3542 7fd9a85b-ad96-42d3-883c-3090e2eb8679
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@ -79,12 +79,17 @@
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# define CONFIG_EXAMPLES_NXFFS_MAXNAME 128
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#endif
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#if CONFIG_EXAMPLES_NXFFS_MAXNAME > 255
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# undef CONFIG_EXAMPLES_NXFFS_MAXNAME
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# define CONFIG_EXAMPLES_NXFFS_MAXNAME 255
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#endif
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#ifndef CONFIG_EXAMPLES_NXFFS_MAXFILE
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# define CONFIG_EXAMPLES_NXFFS_MAXFILE 8192
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#endif
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#ifndef CONFIG_EXAMPLES_NXFFS_GULP
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# define CONFIG_EXAMPLES_NXFFS_GULP 347
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#ifndef CONFIG_EXAMPLES_NXFFS_MAXIO
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# define CONFIG_EXAMPLES_NXFFS_MAXIO 347
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#endif
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#ifndef CONFIG_EXAMPLES_NXFFS_MAXOPEN
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@ -248,12 +253,13 @@ static inline int nxffs_wrfile(void)
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for (offset = 0; offset < file->len; )
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{
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size_t maxio = (rand() % CONFIG_EXAMPLES_NXFFS_MAXIO) + 1;
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size_t nbytestowrite = file->len - offset;
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ssize_t nbyteswritten;
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if (nbytestowrite > CONFIG_EXAMPLES_NXFFS_GULP)
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if (nbytestowrite > maxio)
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{
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nbytestowrite = CONFIG_EXAMPLES_NXFFS_GULP;
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nbytestowrite = maxio;
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}
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nbyteswritten = write(fd, &g_fileimage[offset], nbytestowrite);
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@ -270,7 +276,7 @@ static inline int nxffs_wrfile(void)
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}
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else if (nbyteswritten != nbytestowrite)
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{
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fprintf(stderr, "Partial write: %d\n");
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fprintf(stderr, "Partial write:\n");
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fprintf(stderr, " File name: %s\n", file->name);
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fprintf(stderr, " File size: %d\n", file->len);
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fprintf(stderr, " Write offset: %d\n", offset);
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@ -37,8 +37,8 @@ ifeq ($(CONFIG_FS_NXFFS),y)
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ASRCS +=
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CSRCS += nxffs_block.c nxffs_blockstats.c nxffs_cache.c nxffs_dirent.c \
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nxffs_initialize.c nxffs_inode.c nxffs_ioctl.c nxffs_open.c \
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nxffs_read.c nxffs_reformat.c nxffs_stat.c nxffs_unlink.c \
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nxffs_util.c nxffs_write.c
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nxffs_pack.c nxffs_read.c nxffs_reformat.c nxffs_stat.c \
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nxffs_unlink.c nxffs_util.c nxffs_write.c
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# Argument for dependency checking
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@ -6,7 +6,7 @@ actual relationship is determined by the FLASH geometry reported by the MTD
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driver.
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ERASE LOGICAL Inodes begin with a inode header. inode may
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BLOCK BLOCK CONTENTS be marked as "deleted," pending clean-up.
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BLOCK BLOCK CONTENTS be marked as "deleted," pending re-packing.
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n 4*n --+--------------+
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|BBBBBBBBBBBBBB| Logic block header
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|IIIIIIIIIIIIII| Inodes begin with a inode header
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@ -42,7 +42,7 @@ General operation
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supporting wear leveling by using all FLASH blocks equally.
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When the FLASH becomes full (no more space at the end of the FLASH), a
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clean-up operation must be performed: All inodes marked deleted are
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re-packing operation must be performed: All inodes marked deleted are
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finally removed and the remaining inodes are packed at the beginning of
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the FLASH. Allocations then continue at the freed FLASH memory at the
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end of the FLASH.
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@ -89,7 +89,7 @@ that you should be aware before opting to use NXFFS:
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5. Files may be opened for reading or for writing, but not both: The O_RDWR
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open flag is not supported.
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6. The clean-up process occurs only during a write when the free FLASH
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6. The re-packing process occurs only during a write when the free FLASH
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memory at the end of the FLASH is exhausted. Thus, occasionally, file
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writing may take a long time.
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@ -61,7 +61,7 @@
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* the FLASH geometry reported by the MTD driver.
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*
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* ERASE LOGICAL Inodes begin with a inode header. inode may
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* BLOCK BLOCK CONTENTS be marked as "deleted," pending clean-up.
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* BLOCK BLOCK CONTENTS be marked as "deleted," pending re-packing.
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* n 4*n --+--------------+
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* |BBBBBBBBBBBBBB| Logic block header
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* |IIIIIIIIIIIIII| Inodes begin with a inode header
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@ -95,7 +95,7 @@
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* supporting wear leveling by using all FLASH blocks equally.
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*
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* When the FLASH becomes full (no more space at the end of the FLASH), a
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* clean-up operation must be performed: All inodes marked deleted are
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* re-packing operation must be performed: All inodes marked deleted are
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* finally removed and the remaining inodes are packed at the beginning of
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* the FLASH. Allocations then continue at the freed FLASH memory at the
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* end of the FLASH.
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@ -130,7 +130,7 @@
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* string providing some illusion of directories.
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* 5. Files may be opened for reading or for writing, but not both: The O_RDWR
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* open flag is not supported.
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* 6. The clean-up process occurs only during a write when the free FLASH
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* 6. The re-packing process occurs only during a write when the free FLASH
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* memory at the end of the FLASH is exhausted. Thus, occasionally, file
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* writing may take a long time.
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* 7. Another limitation is that there can be only a single NXFFS volume
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@ -175,7 +175,7 @@
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* flash beyond this point is erased.
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*/
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#define NXFFS_NERASED 128
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#define NXFFS_NERASED 128
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/****************************************************************************
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* Public Types
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@ -185,8 +185,8 @@
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struct nxffs_block_s
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{
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uint8_t magic[4]; /* 0-3: Magic number for valid block */
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uint8_t state; /* 4: Block state: See BLOCK_STATE_* */
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uint8_t magic[4]; /* 0-3: Magic number for valid block */
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uint8_t state; /* 4: Block state: See BLOCK_STATE_* */
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};
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#define SIZEOF_NXFFS_BLOCK_HDR 5
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@ -194,25 +194,25 @@ struct nxffs_block_s
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struct nxffs_inode_s
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{
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uint8_t magic[4]; /* 0-3: Magic number for valid inode */
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uint8_t state; /* 4: Inode state: See INODE_STATE_* */
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uint8_t noffset; /* 5: Offset to the file name from the header */
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uint8_t doffset; /* 5: Offset to data from file header */
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uint8_t utc[4]; /* 7-9: Creation time */
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uint8_t crc[4]; /* 10-13: CRC32 */
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uint8_t datlen[4]; /* 14-17: Length of data in bytes */
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/* 18-: Variable length file name follows */
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uint8_t magic[4]; /* 0-3: Magic number for valid inode */
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uint8_t state; /* 4: Inode state: See INODE_STATE_* */
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uint8_t namlen; /* 5: Length of the inode name */
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uint8_t noffs[4]; /* 6-9: FLASH offset to the file name */
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uint8_t doffs[4]; /* 10-13: FLASH offset to the first data block */
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uint8_t utc[4]; /* 14-17: Creation time */
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uint8_t crc[4]; /* 18-21: CRC32 */
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uint8_t datlen[4]; /* 22-25: Length of data in bytes */
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};
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#define SIZEOF_NXFFS_INODE_HDR 18
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#define SIZEOF_NXFFS_INODE_HDR 26
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/* This structure defines each packed NXFFS data header on the FLASH media */
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struct nxffs_data_s
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{
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uint8_t magic[4]; /* 0-3: Magic number for valid data */
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uint8_t crc[4]; /* 4-7: CRC32 */
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uint8_t datlen[4]; /* 8-11: Length of data in bytes */
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/* 12-: Variable length data follows */
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uint8_t magic[4]; /* 0-3: Magic number for valid data */
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uint8_t crc[4]; /* 4-7: CRC32 */
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uint8_t datlen[4]; /* 8-11: Length of data in bytes */
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/* 12-: Variable length data follows */
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};
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#define SIZEOF_NXFFS_DATA_HDR 12
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@ -222,29 +222,12 @@ struct nxffs_data_s
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struct nxffs_entry_s
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{
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off_t hoffset; /* Offset to the inode on the media */
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off_t doffset; /* Offset to the data on the media */
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FAR char *name; /* inode name */
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uint32_t utc; /* Time stamp */
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uint32_t datlen; /* Length of inode data */
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};
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/* This structure represents the overall state of on NXFFS instance. */
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struct nxffs_volume_s
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{
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FAR struct mtd_dev_s *mtd; /* Supports FLASH access */
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sem_t exclsem; /* Used to assure thread-safe access */
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struct mtd_geometry_s geo; /* Device geometry */
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uint8_t wrbusy: 1; /* 1: Volume open for writing */
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uint8_t blkper; /* R/W blocks per erase block */
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uint8_t ncached; /* Number of blocks in cache */
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uint16_t iooffset; /* Next offset in read/write access (in ioblock) */
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off_t inoffset; /* Offset to the first valid inode header */
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off_t froffset; /* Offset to the first free byte */
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off_t ioblock; /* Current block number being accessed */
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off_t cblock; /* Starting block number in cache */
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FAR uint8_t *cache; /* Allocated erase block */
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off_t hoffset; /* FLASH offset to the inode header */
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off_t noffset; /* FLASH offset to the inode name */
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off_t doffset; /* FLASH offset to the first data header */
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FAR char *name; /* inode name */
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uint32_t utc; /* Time stamp */
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uint32_t datlen; /* Length of inode data */
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};
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/* This structure describes the state of one open file. This structure
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@ -253,10 +236,10 @@ struct nxffs_volume_s
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struct nxffs_ofile_s
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{
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struct nxffs_ofile_s *flink; /* Supports a singly linked list */
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int16_t crefs; /* Reference count */
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mode_t mode; /* Open mode */
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struct nxffs_entry_s entry; /* Describes the NXFFS inode entry */
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struct nxffs_ofile_s *flink; /* Supports a singly linked list */
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int16_t crefs; /* Reference count */
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mode_t mode; /* Open mode */
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struct nxffs_entry_s entry; /* Describes the NXFFS inode entry */
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};
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/* A file opened for writing require some additional information */
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@ -265,7 +248,7 @@ struct nxffs_wrfile_s
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{
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/* The following fields provide the common open file information. */
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struct nxffs_ofile_s ofile;
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struct nxffs_ofile_s ofile;
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/* The following fields are required to support the current write
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* operation. Note that the size of the current block can be determined
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@ -279,24 +262,46 @@ struct nxffs_wrfile_s
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* 5. If the end of the FLASH block is encountered, the data block CRC is
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* calculated and the block header is also written to flash.
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* 6. When the file is closed, the final, partial data block is written to
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* FLASH in the same way. The final file size is determined, the header
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* FLASH in the same way. Any previously identified file with the same
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* name is deleted. The final file size is determined, the header
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* CRC is calculated, and the inode header is written to FLASH, completing
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* the write operation.
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*/
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uint16_t wrlen; /* Number of bytes written in data block */
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off_t dathdr; /* FLASH offset to the current data header */
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bool truncate; /* Delete a file of the same name */
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uint16_t wrlen; /* Number of bytes written in data block */
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off_t dathdr; /* FLASH offset to the current data header */
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};
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/* This structure represents the overall state of on NXFFS instance. */
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struct nxffs_volume_s
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{
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FAR struct mtd_dev_s *mtd; /* Supports FLASH access */
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sem_t exclsem; /* Used to assure thread-safe access */
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struct mtd_geometry_s geo; /* Device geometry */
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uint8_t wrbusy: 1; /* 1: Volume open for writing */
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uint8_t blkper; /* R/W blocks per erase block */
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uint8_t ncached; /* Number of blocks in cache */
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uint16_t iooffset; /* Next offset in read/write access (in ioblock) */
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off_t inoffset; /* Offset to the first valid inode header */
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off_t froffset; /* Offset to the first free byte */
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off_t nblocks; /* Number of R/W blocks on volume */
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off_t ioblock; /* Current block number being accessed */
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off_t cblock; /* Starting block number in cache */
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FAR struct nxffs_ofile_s *ofiles; /* A singly-linked list of open files */
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FAR uint8_t *cache; /* Allocated erase block */
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};
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/* This structure describes the state of the blocks on the NXFFS volume */
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struct nxffs_blkstats_s
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{
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off_t nblocks; /* Total number of FLASH blocks */
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off_t ngood; /* Number of good FLASH blocks found */
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off_t nbad; /* Number of well-formatted FLASH blocks marked as bad */
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off_t nunformat; /* Number of unformatted FLASH blocks */
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off_t ncorrupt; /* Number of blocks with correupted format info */
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off_t nblocks; /* Total number of FLASH blocks */
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off_t ngood; /* Number of good FLASH blocks found */
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off_t nbad; /* Number of well-formatted FLASH blocks marked as bad */
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off_t nunformat; /* Number of unformatted FLASH blocks */
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off_t ncorrupt; /* Number of blocks with correupted format info */
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};
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/****************************************************************************
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@ -327,10 +332,6 @@ extern const uint8_t g_datamagic[NXFFS_MAGICSIZE];
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extern struct nxffs_volume_s g_volume;
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#endif
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/* A singly-linked list of open files */
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extern struct nxffs_ofile_s *g_ofiles;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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@ -345,10 +346,11 @@ extern struct nxffs_ofile_s *g_ofiles;
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*
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* The first, lower limit must be recalculated: (1) initially, (2)
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* whenever the first inode is deleted, or (3) whenever inode is moved
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* as part of the clean-up operation.
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* as part of the file system packing operation.
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*
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* The second, upper limit must be (1) incremented whenever new file
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* data is written, or (2) recalculated as part of the clean-up operation.
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* data is written, or (2) recalculated as part of the file system packing
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* operation.
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*
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* Input Parameters:
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* volume - Identifies the NXFFS volume
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@ -379,7 +381,24 @@ extern int nxffs_limits(FAR struct nxffs_volume_s *volume);
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*
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****************************************************************************/
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extern uint16_t nxffs_rdle16(const uint8_t *val);
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extern uint16_t nxffs_rdle16(FAR const uint8_t *val);
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/****************************************************************************
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* Name: nxffs_wrle16
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*
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* Description:
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* Put a (possibly unaligned) 16-bit little endian value.
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*
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* Input Parameters:
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* dest - A pointer to the first byte to save the little endian value.
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* val - The 16-bit value to be saved.
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*
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* Returned Values:
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* None
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*
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****************************************************************************/
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extern void nxffs_wrle16(uint8_t *dest, uint16_t val);
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/****************************************************************************
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* Name: nxffs_rdle32
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*
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****************************************************************************/
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extern uint32_t nxffs_rdle32(const uint8_t *val);
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extern uint32_t nxffs_rdle32(FAR const uint8_t *val);
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/****************************************************************************
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* Name: nxffs_wrle32
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*
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* Description:
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* Put a (possibly unaligned) 32-bit little endian value.
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*
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* Input Parameters:
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* dest - A pointer to the first byte to save the little endian value.
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* val - The 32-bit value to be saved.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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extern void nxffs_wrle32(uint8_t *dest, uint32_t val);
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/****************************************************************************
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* Name: nxffs_erased
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*
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* Description:
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* Check if the block of memory if in the erased state.
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*
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* Input Parameters:
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* buffer - Address of the start of the memory to check.
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* buflen - The number of bytes to check.
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*
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* Returned Values:
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* true: memory is erased; false: memory is not erased
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*
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* Defined in nxffs_util.c
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*
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****************************************************************************/
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extern bool nxffs_erased(FAR const uint8_t *buffer, size_t buflen);
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/****************************************************************************
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* Name: nxffs_rdcache
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@ -701,6 +756,7 @@ extern int nxffs_reformat(FAR struct nxffs_volume_s *volume);
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* name is one of the opened files.
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*
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* Input Parameters:
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* volume - Describes the NXFFS volume.
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* name - The name of the inode to check.
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*
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* Returned Value:
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*
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****************************************************************************/
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extern FAR struct nxffs_ofile_s *nxffs_findofile(FAR const char *name);
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extern FAR struct nxffs_ofile_s *nxffs_findofile(FAR struct nxffs_volume_s *volume,
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FAR const char *name);
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/****************************************************************************
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* Name: nxffs_wrreserve
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*
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* Description:
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* Find a valid location for a file system object of 'size'. A valid
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* location will have these properties:
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*
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* 1. It will lie in the free flash region.
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* 2. It will have enough contiguous memory to hold the entire object
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* 3. The memory at this location will be fully erased.
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*
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* This function will only perform the checks of 1) and 2). The
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* end-of-filesystem offset, froffset, is update past this memory which,
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* in effect, reserves the memory.
|
||||
*
|
||||
* Input Parameters:
|
||||
* volume - Describes the NXFFS volume
|
||||
* size - The size of the object to be reserved.
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero is returned on success. Otherwise, a negated errno value is
|
||||
* returned indicating the nature of the failure. Of special interest
|
||||
* the return error of -ENOSPC which means that the FLASH volume is
|
||||
* full and should be repacked.
|
||||
*
|
||||
* On successful return the following are also valid:
|
||||
*
|
||||
* volume->ioblock - Read/write block number of the block containing the
|
||||
* candidate oject position
|
||||
* volume->iooffset - The offset in the block to the candidate object
|
||||
* position.
|
||||
* volume->froffset - Updated offset to the first free FLASH block after
|
||||
* the reserved memory.
|
||||
*
|
||||
*
|
||||
* Defined in nxffs_write.c
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
extern int nxffs_wrreserve(FAR struct nxffs_volume_s *volume, size_t size);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_wrverify
|
||||
*
|
||||
* Description:
|
||||
* Find a valid location for the object. A valid location will have
|
||||
* these properties:
|
||||
*
|
||||
* 1. It will lie in the free flash region.
|
||||
* 2. It will have enough contiguous memory to hold the entire header
|
||||
* (excluding the file name which may lie in the next block).
|
||||
* 3. The memory at this location will be fully erased.
|
||||
*
|
||||
* This function will only perform the check 3). On entry it assumes the
|
||||
* following settings (left by nxffs_wrreserve()):
|
||||
*
|
||||
* volume->ioblock - Read/write block number of the block containing the
|
||||
* candidate oject position
|
||||
* volume->iooffset - The offset in the block to the candidate object
|
||||
* position.
|
||||
*
|
||||
* Input Parameters:
|
||||
* volume - Describes the NXFFS volume
|
||||
* size - The size of the object to be verifed.
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero is returned on success. Otherwise, a negated errno value is
|
||||
* returned indicating the nature of the failure. Of special interest
|
||||
* the return error of -ENOSPC which means that the FLASH volume is
|
||||
* full and should be repacked.
|
||||
*
|
||||
* On successful return the following are also valid:
|
||||
*
|
||||
* volume->ioblock - Read/write block number of the block containing the
|
||||
* verified object position
|
||||
* volume->iooffset - The offset in the block to the verified object
|
||||
* position.
|
||||
* volume->froffset - Updated offset to the first free FLASH block.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
extern int nxffs_wrverify(FAR struct nxffs_volume_s *volume, size_t size);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_wrblkhdr
|
||||
*
|
||||
* Description:
|
||||
* Write the block header information. This is done (1) whenever the end-
|
||||
* block is encountered and (2) also when the file is closed in order to
|
||||
* flush the final block of data to FLASH.
|
||||
*
|
||||
* Input Parameters:
|
||||
* volume - Describes the state of the NXFFS volume
|
||||
* wrfile - Describes the state of the open file
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero is returned on success; Otherwise, a negated errno value is
|
||||
* returned to indicate the nature of the failure.
|
||||
*
|
||||
* Defined in nxffs_write.c
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
extern int nxffs_wrblkhdr(FAR struct nxffs_volume_s *volume,
|
||||
FAR struct nxffs_wrfile_s *wrfile);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_rminode
|
||||
*
|
||||
|
@ -733,6 +896,24 @@ extern FAR struct nxffs_ofile_s *nxffs_findofile(FAR const char *name);
|
|||
|
||||
extern int nxffs_rminode(FAR struct nxffs_volume_s *volume, FAR const char *name);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_pack
|
||||
*
|
||||
* Description:
|
||||
* Pack and re-write the filesystem in order to free up memory at the end
|
||||
* of FLASH.
|
||||
*
|
||||
* Input Parameters:
|
||||
* volume - The volume to be packed.
|
||||
*
|
||||
* Returned Values:
|
||||
* Zero on success; Otherwise, a negated errno value is returned to
|
||||
* indicate the nature of the failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
extern int nxffs_pack(FAR struct nxffs_volume_s *volume);
|
||||
|
||||
/****************************************************************************
|
||||
* Standard mountpoint operation methods
|
||||
*
|
||||
|
|
|
@ -105,7 +105,7 @@ int nxffs_verifyblock(FAR struct nxffs_volume_s *volume, off_t block)
|
|||
|
||||
/* Check if the block has a magic number (meaning that it is not
|
||||
* erased) and that it is valid (meaning that it is not marked
|
||||
* for cleanup)
|
||||
* for deletion)
|
||||
*/
|
||||
|
||||
blkhdr = (FAR struct nxffs_block_s *)volume->cache;
|
||||
|
@ -147,7 +147,7 @@ int nxffs_validblock(struct nxffs_volume_s *volume, off_t *block)
|
|||
|
||||
/* Loop for each possible block or until a valid block is found */
|
||||
|
||||
for (i = *block; i < volume->geo.neraseblocks * volume->blkper; i++)
|
||||
for (i = *block; i < volume->nblocks; i++)
|
||||
{
|
||||
/* Loop until we find a valid block */
|
||||
|
||||
|
@ -161,6 +161,10 @@ int nxffs_validblock(struct nxffs_volume_s *volume, off_t *block)
|
|||
}
|
||||
}
|
||||
|
||||
/* ENOSPC is special return value that means that there is no further,
|
||||
* valid blocks left in the volume.
|
||||
*/
|
||||
|
||||
fdbg("No valid block found\n");
|
||||
return -ENOENT;
|
||||
return -ENOSPC;
|
||||
}
|
||||
|
|
|
@ -206,9 +206,12 @@ int nxffs_initialize(FAR struct mtd_dev_s *mtd)
|
|||
goto errout_with_volume;
|
||||
}
|
||||
|
||||
/* Get the number of R/W blocks per erase block */
|
||||
/* Get the number of R/W blocks per erase block and the total number o
|
||||
* R/W blocks
|
||||
*/
|
||||
|
||||
volume->blkper = volume->geo.erasesize / volume->geo.blocksize;
|
||||
volume->blkper = volume->geo.erasesize / volume->geo.blocksize;
|
||||
volume->nblocks = volume->geo.neraseblocks * volume->blkper;
|
||||
DEBUGASSERT((off_t)volume->blkper * volume->geo.blocksize == volume->geo.erasesize);
|
||||
|
||||
/* Check if there is a valid NXFFS file system on the flash */
|
||||
|
@ -274,10 +277,11 @@ errout_with_volume:
|
|||
*
|
||||
* The first, lower limit must be recalculated: (1) initially, (2)
|
||||
* whenever the first inode is deleted, or (3) whenever inode is moved
|
||||
* as part of the clean-up operation.
|
||||
* as part of the file system packing operation.
|
||||
*
|
||||
* The second, upper limit must be (1) incremented whenever new file
|
||||
* data is written, or (2) recalculated as part of the clean-up operation.
|
||||
* data is written, or (2) recalculated as part of the file system packing
|
||||
* operation.
|
||||
*
|
||||
* Input Parameters:
|
||||
* volume - Identifies the NXFFS volume
|
||||
|
@ -477,5 +481,9 @@ int nxffs_bind(FAR struct inode *blkdriver, FAR const void *data,
|
|||
|
||||
int nxffs_unbind(FAR void *handle, FAR struct inode **blkdriver)
|
||||
{
|
||||
return g_ofiles ? -EBUSY : OK;
|
||||
#ifndef CONFIG_NXFSS_PREALLOCATED
|
||||
# error "No design to support dynamic allocation of volumes"
|
||||
#else
|
||||
return g_volume.ofiles ? -EBUSY : OK;
|
||||
#endif
|
||||
}
|
||||
|
|
|
@ -93,7 +93,7 @@ static int nxffs_rdentry(FAR struct nxffs_volume_s *volume, off_t offset,
|
|||
struct nxffs_inode_s inode;
|
||||
uint32_t ecrc;
|
||||
uint32_t crc;
|
||||
int namelen;
|
||||
int namlen;
|
||||
int ret;
|
||||
|
||||
DEBUGASSERT(volume && entry);
|
||||
|
@ -119,7 +119,8 @@ static int nxffs_rdentry(FAR struct nxffs_volume_s *volume, off_t offset,
|
|||
/* Copy the packed header into the user-friendly buffer */
|
||||
|
||||
entry->hoffset = offset;
|
||||
entry->doffset = offset + inode.doffset;
|
||||
entry->noffset = nxffs_rdle32(inode.noffs);
|
||||
entry->doffset = nxffs_rdle32(inode.doffs);
|
||||
entry->utc = nxffs_rdle32(inode.utc);
|
||||
entry->datlen = nxffs_rdle32(inode.datlen);
|
||||
|
||||
|
@ -132,34 +133,27 @@ static int nxffs_rdentry(FAR struct nxffs_volume_s *volume, off_t offset,
|
|||
|
||||
/* Allocate memory to hold the variable-length file name */
|
||||
|
||||
namelen = (int)inode.doffset - (int)inode.noffset;
|
||||
if (namelen < 0)
|
||||
{
|
||||
fdbg("Bad offsets, name: %d data: %d\n", inode.noffset, inode.doffset);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
entry->name = (FAR char *)kmalloc(namelen+1);
|
||||
entry->name = (FAR char *)kmalloc(inode.namlen + 1);
|
||||
if (!entry->name)
|
||||
{
|
||||
fdbg("Failed to allocate name, namelen: %d\n", namelen);
|
||||
fdbg("Failed to allocate name, namlen: %d\n", inode.namlen);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
/* Read the file name from the expected offset in FLASH */
|
||||
|
||||
nxffs_ioseek(volume, offset + inode.noffset);
|
||||
ret = nxffs_rddata(volume, (FAR uint8_t*)entry->name, namelen);
|
||||
nxffs_ioseek(volume, entry->noffset);
|
||||
ret = nxffs_rddata(volume, (FAR uint8_t*)entry->name, namlen);
|
||||
if (ret < 0)
|
||||
{
|
||||
fdbg("Failed to read inode, offset %d: %d\n", offset, -ret);
|
||||
return -EIO;
|
||||
}
|
||||
entry->name[namelen] = '\0';
|
||||
entry->name[namlen] = '\0';
|
||||
|
||||
/* Finish the CRC calculation and verify the entry */
|
||||
|
||||
crc = crc32part(entry->name, namelen, crc);
|
||||
crc = crc32part((FAR const uint8_t *)entry->name, namlen, crc);
|
||||
if (crc != ecrc)
|
||||
{
|
||||
fdbg("CRC entry: %08x CRC calculated: %08x\n", ecrc, crc);
|
||||
|
@ -332,7 +326,7 @@ int nxffs_findinode(FAR struct nxffs_volume_s *volume, FAR const char *name,
|
|||
int ret;
|
||||
|
||||
/* Start with the first valid inode that was discovered when the volume
|
||||
* was created (or modified after the last cleanup).
|
||||
* was created (or modified after the last file system re-packing).
|
||||
*/
|
||||
|
||||
offset = volume->inoffset;
|
||||
|
|
|
@ -43,6 +43,8 @@
|
|||
|
||||
#include <string.h>
|
||||
#include <fcntl.h>
|
||||
#include <time.h>
|
||||
#include <crc32.h>
|
||||
#include <assert.h>
|
||||
#include <errno.h>
|
||||
#include <debug.h>
|
||||
|
@ -65,10 +67,6 @@
|
|||
* Public Variables
|
||||
****************************************************************************/
|
||||
|
||||
/* A singly-linked list of open files */
|
||||
|
||||
struct nxffs_ofile_s *g_ofiles;
|
||||
|
||||
/****************************************************************************
|
||||
* Private Variables
|
||||
****************************************************************************/
|
||||
|
@ -78,22 +76,241 @@ struct nxffs_ofile_s *g_ofiles;
|
|||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_create
|
||||
* Name: nxffs_hdrpos
|
||||
*
|
||||
* Description:
|
||||
* Create a file: Verify the sufficient space exists at the end of the
|
||||
* FLASH. If so, then write then update entry in preparation for writing.
|
||||
* Find a valid location for the inode header. A valid location will have
|
||||
* these properties:
|
||||
*
|
||||
* 1. It will lie in the free flash region.
|
||||
* 2. It will have enough contiguous memory to hold the entire header
|
||||
* (excluding the file name which may lie in the next block).
|
||||
* 3. The memory at this location will be fully erased.
|
||||
*
|
||||
* This function will only perform the checks of 1) and 2).
|
||||
*
|
||||
* Input Parameters:
|
||||
* volume - Describes the NXFFS volume
|
||||
* wrfile - Contains the current guess for the header position. On
|
||||
* successful return, this field will hold the selected header
|
||||
* position.
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero is returned on success. Otherwise, a negated errno value is
|
||||
* returned indicating the nature of the failure. Of special interest
|
||||
* the return error of -ENOSPC which means that the FLASH volume is
|
||||
* full and should be repacked.
|
||||
*
|
||||
* On successful return the following are also valid:
|
||||
*
|
||||
* wrfile->ofile.entry.hoffset - Flash offset to candidate header position
|
||||
* volume->ioblock - Read/write block number of the block containing the
|
||||
* header position
|
||||
* volume->iooffset - The offset in the block to the candidate header
|
||||
* position.
|
||||
* volume->froffset - Updated offset to the first free FLASH block.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static inline int nxffs_create(FAR struct nxffs_volume_s *volume,
|
||||
FAR const char *name, mode_t mode,
|
||||
FAR struct nxffs_ofile_s **ppofile)
|
||||
static inline int nxffs_hdrpos(FAR struct nxffs_volume_s *volume,
|
||||
FAR struct nxffs_wrfile_s *wrfile)
|
||||
{
|
||||
#warning "Check if too close to end of block for whole header"
|
||||
int ret;
|
||||
|
||||
/* Reserve memory for the object */
|
||||
|
||||
ret = nxffs_wrreserve(volume, SIZEOF_NXFFS_INODE_HDR);
|
||||
if (ret == OK)
|
||||
{
|
||||
/* Save the offset to the FLASH region reserved for the inode header */
|
||||
|
||||
wrfile->ofile.entry.hoffset =
|
||||
volume->ioblock * volume->geo.blocksize + volume->iooffset;
|
||||
}
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_nampos
|
||||
*
|
||||
* Description:
|
||||
* Find a valid location for the inode name. A valid location will have
|
||||
* these properties:
|
||||
*
|
||||
* 1. It will lie in the free flash region.
|
||||
* 2. It will have enough contiguous memory to hold the entire name
|
||||
* 3. The memory at this location will be fully erased.
|
||||
*
|
||||
* This function will only perform the checks of 1) and 2).
|
||||
*
|
||||
* Input Parameters:
|
||||
* volume - Describes the NXFFS volume
|
||||
* wrfile - Contains the current guess for the name position. On
|
||||
* successful return, this field will hold the selected name
|
||||
* position.
|
||||
* namlen - The length of the name.
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero is returned on success. Otherwise, a negated errno value is
|
||||
* returned indicating the nature of the failure. Of special interest
|
||||
* the return error of -ENOSPC which means that the FLASH volume is
|
||||
* full and should be repacked.
|
||||
*
|
||||
* On successful return the following are also valid:
|
||||
*
|
||||
* wrfile->ofile.entry.noffset - Flash offset to candidate name position
|
||||
* volume->ioblock - Read/write block number of the block containing the
|
||||
* name position
|
||||
* volume->iooffset - The offset in the block to the candidate name
|
||||
* position.
|
||||
* volume->froffset - Updated offset to the first free FLASH block.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static inline int nxffs_nampos(FAR struct nxffs_volume_s *volume,
|
||||
FAR struct nxffs_wrfile_s *wrfile,
|
||||
int namlen)
|
||||
{
|
||||
int ret;
|
||||
|
||||
/* Reserve memory for the object */
|
||||
|
||||
ret = nxffs_wrreserve(volume, namlen);
|
||||
if (ret == OK)
|
||||
{
|
||||
/* Save the offset to the FLASH region reserved for the inode name */
|
||||
|
||||
wrfile->ofile.entry.noffset =
|
||||
volume->ioblock * volume->geo.blocksize + volume->iooffset;
|
||||
}
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_hdrerased
|
||||
*
|
||||
* Description:
|
||||
* Find a valid location for the inode header. A valid location will have
|
||||
* these properties:
|
||||
*
|
||||
* 1. It will lie in the free flash region.
|
||||
* 2. It will have enough contiguous memory to hold the entire header
|
||||
* (excluding the file name which may lie in the next block).
|
||||
* 3. The memory at this location will be fully erased.
|
||||
*
|
||||
* This function will only perform the check 3).
|
||||
*
|
||||
* On entry it assumes:
|
||||
*
|
||||
* volume->ioblock - Read/write block number of the block containing the
|
||||
* header position
|
||||
* volume->iooffset - The offset in the block to the candidate header
|
||||
* position.
|
||||
*
|
||||
* Input Parameters:
|
||||
* volume - Describes the NXFFS volume
|
||||
* wrfile - Contains the current guess for the header position. On
|
||||
* successful return, this field will hold the selected header
|
||||
* position.
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero is returned on success. Otherwise, a negated errno value is
|
||||
* returned indicating the nature of the failure. Of special interest
|
||||
* the return error of -ENOSPC which means that the FLASH volume is
|
||||
* full and should be repacked.
|
||||
*
|
||||
* On successful return the following are also valid:
|
||||
*
|
||||
* wrfile->ofile.entry.hoffset - Flash offset to candidate header position
|
||||
* volume->ioblock - Read/write block number of the block containing the
|
||||
* header position
|
||||
* volume->iooffset - The offset in the block to the candidate header
|
||||
* position.
|
||||
* volume->froffset - Updated offset to the first free FLASH block.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static inline int nxffs_hdrerased(FAR struct nxffs_volume_s *volume,
|
||||
FAR struct nxffs_wrfile_s *wrfile)
|
||||
{
|
||||
int ret;
|
||||
|
||||
/* Find a valid location to save the inode header */
|
||||
|
||||
ret = nxffs_wrverify(volume, SIZEOF_NXFFS_INODE_HDR);
|
||||
if (ret == OK)
|
||||
{
|
||||
/* This is where we will put the header */
|
||||
|
||||
wrfile->ofile.entry.hoffset =
|
||||
volume->ioblock * volume->geo.blocksize + volume->iooffset;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_namerased
|
||||
*
|
||||
* Description:
|
||||
* Find a valid location for the inode name. A valid location will have
|
||||
* these properties:
|
||||
*
|
||||
* 1. It will lie in the free flash region.
|
||||
* 2. It will have enough contiguous memory to hold the entire name
|
||||
* (excluding the file name which may lie in the next block).
|
||||
* 3. The memory at this location will be fully erased.
|
||||
*
|
||||
* This function will only perform the check 3).
|
||||
*
|
||||
* On entry it assumes:
|
||||
*
|
||||
* volume->ioblock - Read/write block number of the block containing the
|
||||
* name position
|
||||
* volume->iooffset - The offset in the block to the candidate name
|
||||
* position.
|
||||
*
|
||||
* Input Parameters:
|
||||
* volume - Describes the NXFFS volume
|
||||
* wrfile - Contains the current guess for the name position. On
|
||||
* successful return, this field will hold the selected name
|
||||
* position.
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero is returned on success. Otherwise, a negated errno value is
|
||||
* returned indicating the nature of the failure. Of special interest
|
||||
* the return error of -ENOSPC which means that the FLASH volume is
|
||||
* full and should be repacked.
|
||||
*
|
||||
* On successful return the following are also valid:
|
||||
*
|
||||
* wrfile->ofile.entry.noffset - Flash offset to candidate name position
|
||||
* volume->ioblock - Read/write block number of the block containing the
|
||||
* name position
|
||||
* volume->iooffset - The offset in the block to the candidate name
|
||||
* position.
|
||||
* volume->froffset - Updated offset to the first free FLASH block.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static inline int nxffs_namerased(FAR struct nxffs_volume_s *volume,
|
||||
FAR struct nxffs_wrfile_s *wrfile,
|
||||
int namlen)
|
||||
{
|
||||
int ret;
|
||||
|
||||
/* Find a valid location to save the inode name */
|
||||
|
||||
ret = nxffs_wrverify(volume, namlen);
|
||||
if (ret == OK)
|
||||
{
|
||||
/* This is where we will put the name */
|
||||
|
||||
wrfile->ofile.entry.hoffset =
|
||||
volume->ioblock * volume->geo.blocksize + volume->iooffset;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_wropen
|
||||
*
|
||||
|
@ -109,6 +326,9 @@ static inline int nxffs_wropen(FAR struct nxffs_volume_s *volume,
|
|||
{
|
||||
FAR struct nxffs_wrfile_s *wrfile;
|
||||
FAR struct nxffs_entry_s entry;
|
||||
bool packed;
|
||||
bool truncate = false;
|
||||
int namlen;
|
||||
int ret;
|
||||
|
||||
/* Limitation: Only a single writer is permitted. Writing may involve
|
||||
|
@ -119,7 +339,8 @@ static inline int nxffs_wropen(FAR struct nxffs_volume_s *volume,
|
|||
if (volume->wrbusy)
|
||||
{
|
||||
fdbg("There is already a file writer\n");
|
||||
return -ENOSYS;
|
||||
ret = -ENOSYS;
|
||||
goto errout;
|
||||
}
|
||||
|
||||
/* Check if the file exists */
|
||||
|
@ -134,7 +355,8 @@ static inline int nxffs_wropen(FAR struct nxffs_volume_s *volume,
|
|||
if ((mode & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL))
|
||||
{
|
||||
fdbg("File exists, can't create O_EXCL\n");
|
||||
return -EEXIST;
|
||||
ret = -EEXIST;
|
||||
goto errout;
|
||||
}
|
||||
|
||||
/* Were we asked to truncate the file? NOTE: Don't truncate the
|
||||
|
@ -144,15 +366,12 @@ static inline int nxffs_wropen(FAR struct nxffs_volume_s *volume,
|
|||
|
||||
else if ((mode & (O_CREAT|O_TRUNC)) == (O_CREAT|O_TRUNC))
|
||||
{
|
||||
/* Just remove the file and fall through to re-create it */
|
||||
#warning "Should defer file removal until new file successfully written"
|
||||
/* Just schedule the removal the file and fall through to re-create it.
|
||||
* Note that the old file of the same name will not actually be removed
|
||||
* until the new file is successfully written.
|
||||
*/
|
||||
|
||||
ret = nxffs_rminode(volume, name);
|
||||
if (ret < 0)
|
||||
{
|
||||
fdbg("nxffs_rminode failed: %d\n", -ret);
|
||||
return ret;
|
||||
}
|
||||
truncate = true;
|
||||
}
|
||||
|
||||
/* The file exists and we were not asked to truncate (and recreate) it.
|
||||
|
@ -162,7 +381,8 @@ static inline int nxffs_wropen(FAR struct nxffs_volume_s *volume,
|
|||
else
|
||||
{
|
||||
fdbg("File %s exists and we were not asked to truncate it\n");
|
||||
return -ENOSYS;
|
||||
ret = -ENOSYS;
|
||||
goto errout;
|
||||
}
|
||||
}
|
||||
|
||||
|
@ -173,7 +393,18 @@ static inline int nxffs_wropen(FAR struct nxffs_volume_s *volume,
|
|||
if ((mode & O_CREAT) == 0)
|
||||
{
|
||||
fdbg("Not asked to create the file\n");
|
||||
return -ENOENT;
|
||||
ret = -ENOENT;
|
||||
goto errout;
|
||||
}
|
||||
|
||||
/* Make sure that the length of the file name will fit in a uint8_t */
|
||||
|
||||
namlen = strlen(name);
|
||||
if (namlen > UINT8_MAX)
|
||||
{
|
||||
fdbg("Name is too long: %d\n", namlen);
|
||||
ret = -EINVAL;
|
||||
goto errout;
|
||||
}
|
||||
|
||||
/* Yes.. Create a new structure that will describe the state of this open
|
||||
|
@ -184,21 +415,134 @@ static inline int nxffs_wropen(FAR struct nxffs_volume_s *volume,
|
|||
wrfile = (FAR struct nxffs_wrfile_s *)kzalloc(sizeof(struct nxffs_wrfile_s));
|
||||
if (!wrfile)
|
||||
{
|
||||
return -ENOMEM;
|
||||
ret = -ENOMEM;
|
||||
goto errout;
|
||||
}
|
||||
|
||||
/* Initialize the open file state structure */
|
||||
|
||||
wrfile->ofile.crefs = 1;
|
||||
wrfile->ofile.crefs = 1;
|
||||
wrfile->ofile.mode = O_WROK;
|
||||
wrfile->ofile.entry.utc = time(NULL);
|
||||
wrfile->truncate = truncate;
|
||||
|
||||
/* Allocate FLASH memory for the file and set up for the write */
|
||||
/* Allocate FLASH memory for the file and set up for the write.
|
||||
*
|
||||
* Loop until the inode header is configured or until a failure occurs.
|
||||
* Note that nothing is written to FLASH. The inode header is not
|
||||
* written until the file is closed.
|
||||
*/
|
||||
|
||||
#warning "Missing Logic"
|
||||
packed = false;
|
||||
for (;;)
|
||||
{
|
||||
/* File a valid location to position the inode header. Start with the
|
||||
* first byte in the free FLASH region.
|
||||
*/
|
||||
|
||||
ret = nxffs_hdrpos(volume, wrfile);
|
||||
if (ret == OK)
|
||||
{
|
||||
/* Find a region of memory in the block that is fully erased */
|
||||
|
||||
ret = nxffs_hdrerased(volume, wrfile);
|
||||
if (ret == OK)
|
||||
{
|
||||
/* Valid memory for the inode header was found. Break out of
|
||||
* the loop.
|
||||
*/
|
||||
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* If no valid memory is found searching to the end of the volume,
|
||||
* then -ENOSPC will be returned. Other errors are not handled.
|
||||
*/
|
||||
|
||||
if (ret != -ENOSPC || packed)
|
||||
{
|
||||
fdbg("Failed to find inode header memory: %d\n", -ret);
|
||||
goto errout_with_ofile;
|
||||
}
|
||||
|
||||
/* -ENOSPC is a special case.. It means that the volume is full.
|
||||
* Try to pack the volume in order to free up some space.
|
||||
*/
|
||||
|
||||
ret = nxffs_pack(volume);
|
||||
if (ret < 0)
|
||||
{
|
||||
fdbg("Failed to pack the volume: %d\n", -ret);
|
||||
goto errout_with_ofile;
|
||||
}
|
||||
|
||||
/* After packing the volume, froffset will be updated to point to the
|
||||
* new free flash region. Try again.
|
||||
*/
|
||||
|
||||
packed = true;
|
||||
}
|
||||
|
||||
/* Loop until the inode name is configured or until a failure occurs.
|
||||
* Note that nothing is written to FLASH. The inode name is not
|
||||
* written until the file is closed.
|
||||
*/
|
||||
|
||||
for (;;)
|
||||
{
|
||||
/* File a valid location to position the inode name. Start with the
|
||||
* first byte in the free FLASH region.
|
||||
*/
|
||||
|
||||
ret = nxffs_nampos(volume, wrfile, namlen);
|
||||
if (ret == OK)
|
||||
{
|
||||
/* Find a region of memory in the block that is fully erased */
|
||||
|
||||
ret = nxffs_namerased(volume, wrfile, namlen);
|
||||
if (ret == OK)
|
||||
{
|
||||
/* Valid memory for the inode header was found. Break out of
|
||||
* the loop.
|
||||
*/
|
||||
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* If no valid memory is found searching to the end of the volume,
|
||||
* then -ENOSPC will be returned. Other errors are not handled.
|
||||
*/
|
||||
|
||||
if (ret != -ENOSPC || packed)
|
||||
{
|
||||
fdbg("Failed to find inode name memory: %d\n", -ret);
|
||||
goto errout_with_ofile;
|
||||
}
|
||||
|
||||
/* -ENOSPC is a special case.. It means that the volume is full.
|
||||
* Try to pack the volume in order to free up some space.
|
||||
*/
|
||||
|
||||
ret = nxffs_pack(volume);
|
||||
if (ret < 0)
|
||||
{
|
||||
fdbg("Failed to pack the volume: %d\n", -ret);
|
||||
goto errout_with_ofile;
|
||||
}
|
||||
|
||||
/* After packing the volume, froffset will be updated to point to the
|
||||
* new free flash region. Try again.
|
||||
*/
|
||||
|
||||
packed = true;
|
||||
}
|
||||
|
||||
/* Add the open file structure to the head of the list of open files */
|
||||
|
||||
wrfile->ofile.flink = g_ofiles;
|
||||
g_ofiles = &wrfile->ofile;
|
||||
wrfile->ofile.flink = volume->ofiles;
|
||||
volume->ofiles = &wrfile->ofile;
|
||||
|
||||
/* Indicate that the volume is open for writing and return the open file
|
||||
* instance.
|
||||
|
@ -207,6 +551,11 @@ static inline int nxffs_wropen(FAR struct nxffs_volume_s *volume,
|
|||
volume->wrbusy = 1;
|
||||
*ppofile = &wrfile->ofile;
|
||||
return OK;
|
||||
|
||||
errout_with_ofile:
|
||||
kfree(wrfile);
|
||||
errout:
|
||||
return ret;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
|
@ -226,7 +575,7 @@ static inline int nxffs_rdopen(FAR struct nxffs_volume_s *volume,
|
|||
|
||||
/* Check if the file has already been opened (for reading) */
|
||||
|
||||
ofile = nxffs_findofile(name);
|
||||
ofile = nxffs_findofile(volume, name);
|
||||
if (ofile)
|
||||
{
|
||||
/* The file is already open.
|
||||
|
@ -263,7 +612,8 @@ static inline int nxffs_rdopen(FAR struct nxffs_volume_s *volume,
|
|||
|
||||
/* Initialize the open file state structure */
|
||||
|
||||
ofile->crefs = 1;
|
||||
ofile->crefs = 1;
|
||||
ofile->mode = O_RDOK;
|
||||
|
||||
/* Find the file on this volume associated with this file name */
|
||||
|
||||
|
@ -277,8 +627,8 @@ static inline int nxffs_rdopen(FAR struct nxffs_volume_s *volume,
|
|||
|
||||
/* Add the open file structure to the head of the list of open files */
|
||||
|
||||
ofile->flink = g_ofiles;
|
||||
g_ofiles = ofile;
|
||||
ofile->flink = volume->ofiles;
|
||||
volume->ofiles = ofile;
|
||||
}
|
||||
|
||||
/* Return the open file state structure */
|
||||
|
@ -295,14 +645,15 @@ static inline int nxffs_rdopen(FAR struct nxffs_volume_s *volume,
|
|||
*
|
||||
****************************************************************************/
|
||||
|
||||
static inline void nxffs_freeofile(FAR struct nxffs_ofile_s *ofile)
|
||||
static inline void nxffs_freeofile(FAR struct nxffs_volume_s *volume,
|
||||
FAR struct nxffs_ofile_s *ofile)
|
||||
{
|
||||
FAR struct nxffs_ofile_s *prev;
|
||||
FAR struct nxffs_ofile_s *curr;
|
||||
|
||||
/* Find the open file structure to be removed */
|
||||
|
||||
for (prev = NULL, curr = g_ofiles;
|
||||
for (prev = NULL, curr = volume->ofiles;
|
||||
curr && curr != ofile;
|
||||
prev = curr, curr = curr->flink);
|
||||
|
||||
|
@ -318,7 +669,7 @@ static inline void nxffs_freeofile(FAR struct nxffs_ofile_s *ofile)
|
|||
}
|
||||
else
|
||||
{
|
||||
g_ofiles = ofile->flink;
|
||||
volume->ofiles = ofile->flink;
|
||||
}
|
||||
|
||||
/* Then free the open file */
|
||||
|
@ -332,6 +683,146 @@ static inline void nxffs_freeofile(FAR struct nxffs_ofile_s *ofile)
|
|||
}
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_wrclose
|
||||
*
|
||||
* Description:
|
||||
* Perform special operations when a file is closed:
|
||||
* 1. Write the file block header
|
||||
* 2. Remove any file with the same name that was discovered when the
|
||||
* file was open for writing, and finally,
|
||||
* 3. Write the new file inode.
|
||||
*
|
||||
* Input parameters
|
||||
* volume - Describes the NXFFS volume
|
||||
* wrfile - Describes the state of the open file
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int nxffs_wrclose(FAR struct nxffs_volume_s *volume,
|
||||
FAR struct nxffs_wrfile_s *wrfile)
|
||||
{
|
||||
FAR struct nxffs_inode_s *inode;
|
||||
off_t namblock;
|
||||
uint16_t namoffset;
|
||||
uint32_t crc;
|
||||
int namlen;
|
||||
int ret;
|
||||
|
||||
/* Write the final file block header */
|
||||
|
||||
ret = nxffs_wrblkhdr(volume, wrfile);
|
||||
if (ret < 0)
|
||||
{
|
||||
fdbg("Failed to write the final block of the file: %d\n", -ret);
|
||||
goto errout;
|
||||
}
|
||||
|
||||
if (wrfile->truncate)
|
||||
{
|
||||
fvdbg("Removing old file: %s\n", wrfile->ofile.entry.name);
|
||||
|
||||
ret = nxffs_rminode(volume, wrfile->ofile.entry.name);
|
||||
if (ret < 0)
|
||||
{
|
||||
fdbg("nxffs_rminode failed: %d\n", -ret);
|
||||
goto errout;
|
||||
}
|
||||
}
|
||||
|
||||
/* Write the inode header to FLASH. First get the block where we will
|
||||
* write the file name.
|
||||
*/
|
||||
|
||||
nxffs_ioseek(volume, wrfile->ofile.entry.noffset);
|
||||
namblock = volume->ioblock;
|
||||
namoffset = volume->iooffset;
|
||||
|
||||
/* Now seek to the inode header position and assure that it is in the
|
||||
* volume cache.
|
||||
*/
|
||||
|
||||
nxffs_ioseek(volume, wrfile->ofile.entry.hoffset);
|
||||
ret = nxffs_rdcache(volume, volume->ioblock, 1);
|
||||
if (ret < 0)
|
||||
{
|
||||
fdbg("Failed to read inode header block %d: %d\n", volume->ioblock, -ret);
|
||||
goto errout;
|
||||
}
|
||||
|
||||
/* Get the length of the inode name */
|
||||
|
||||
namlen = strlen(wrfile->ofile.entry.name);
|
||||
DEBUGASSERT(namlen < UINT8_MAX); /* This was verified earlier */
|
||||
|
||||
/* Initialize the inode header */
|
||||
|
||||
inode = (FAR struct nxffs_inode_s *)&volume->cache[volume->iooffset];
|
||||
memcmp(inode->magic, g_inodemagic, NXFFS_MAGICSIZE);
|
||||
|
||||
inode->state = CONFIG_NXFFS_ERASEDSTATE;
|
||||
inode->namlen = namlen;
|
||||
|
||||
nxffs_wrle32(inode->noffs, wrfile->ofile.entry.noffset);
|
||||
nxffs_wrle32(inode->doffs, wrfile->ofile.entry.doffset);
|
||||
nxffs_wrle32(inode->utc, wrfile->ofile.entry.utc);
|
||||
nxffs_wrle32(inode->crc, 0);
|
||||
nxffs_wrle32(inode->noffs, wrfile->ofile.entry.datlen);
|
||||
|
||||
/* Calculate the CRC */
|
||||
|
||||
crc = crc32((FAR const uint8_t *)inode, SIZEOF_NXFFS_INODE_HDR);
|
||||
crc = crc32part((FAR const uint8_t *)wrfile->ofile.entry.name, namlen, crc);
|
||||
|
||||
/* Finish the inode header */
|
||||
|
||||
inode->state = INODE_STATE_FILE;
|
||||
nxffs_wrle32(inode->crc, crc);
|
||||
|
||||
/* Are the inode header and the inode name in the same block? Normally,
|
||||
* they will be in the same block. However, they could potentially be
|
||||
* far apart due to intervening bad blocks.
|
||||
*/
|
||||
|
||||
if (volume->ioblock != namblock)
|
||||
{
|
||||
/* Write the block with the inode header */
|
||||
|
||||
ret = nxffs_wrcache(volume, volume->ioblock, 1);
|
||||
if (ret < 0)
|
||||
{
|
||||
fdbg("Failed to write inode header block %d: %d\n", volume->ioblock, -ret);
|
||||
goto errout;
|
||||
}
|
||||
|
||||
/* Make sure the that block containing the inode name is in the cache */
|
||||
|
||||
volume->ioblock = namblock;
|
||||
volume->iooffset = namoffset;
|
||||
ret = nxffs_rdcache(volume, volume->ioblock, 1);
|
||||
if (ret < 0)
|
||||
{
|
||||
fdbg("Failed to read inode name block %d: %d\n", volume->ioblock, -ret);
|
||||
goto errout;
|
||||
}
|
||||
}
|
||||
|
||||
/* Finally, copy the inode name to the cache and write the inode name block */
|
||||
|
||||
memcpy(&volume->cache[namoffset], wrfile->ofile.entry.name, namlen);
|
||||
ret = nxffs_wrcache(volume, volume->ioblock, 1);
|
||||
if (ret < 0)
|
||||
{
|
||||
fdbg("Failed to write inode header block %d: %d\n", volume->ioblock, -ret);
|
||||
}
|
||||
|
||||
/* The volume is now available for other writers */
|
||||
|
||||
errout:
|
||||
volume->wrbusy = 0;
|
||||
return ret;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Public Functions
|
||||
****************************************************************************/
|
||||
|
@ -353,7 +844,8 @@ static inline void nxffs_freeofile(FAR struct nxffs_ofile_s *ofile)
|
|||
*
|
||||
****************************************************************************/
|
||||
|
||||
FAR struct nxffs_ofile_s *nxffs_findofile(FAR const char *name)
|
||||
FAR struct nxffs_ofile_s *nxffs_findofile(FAR struct nxffs_volume_s *volume,
|
||||
FAR const char *name)
|
||||
{
|
||||
FAR struct nxffs_ofile_s *ofile;
|
||||
|
||||
|
@ -361,7 +853,7 @@ FAR struct nxffs_ofile_s *nxffs_findofile(FAR const char *name)
|
|||
* list of open files.
|
||||
*/
|
||||
|
||||
for (ofile = g_ofiles; ofile; ofile = ofile->flink)
|
||||
for (ofile = volume->ofiles; ofile; ofile = ofile->flink)
|
||||
{
|
||||
/* Check for a name match */
|
||||
|
||||
|
@ -501,13 +993,21 @@ int nxffs_close(FAR struct file *filep)
|
|||
|
||||
/* Decrement the reference count on the open file */
|
||||
|
||||
ret = OK;
|
||||
if (ofile->crefs == 1)
|
||||
{
|
||||
/* Decrementing the reference count would take it zero. Time to
|
||||
* delete the open file state.
|
||||
/* Decrementing the reference count would take it zero. Handle
|
||||
* finalization of the write operation.
|
||||
*/
|
||||
|
||||
nxffs_freeofile(ofile);
|
||||
if (ofile->mode == O_WROK)
|
||||
{
|
||||
ret = nxffs_wrclose(volume, (FAR struct nxffs_wrfile_s *)ofile);
|
||||
}
|
||||
|
||||
/* Delete the open file state structure */
|
||||
|
||||
nxffs_freeofile(volume, ofile);
|
||||
}
|
||||
else
|
||||
{
|
||||
|
@ -517,7 +1017,6 @@ int nxffs_close(FAR struct file *filep)
|
|||
}
|
||||
|
||||
filep->f_priv = NULL;
|
||||
ret = OK;
|
||||
|
||||
sem_post(&volume->exclsem);
|
||||
errout:
|
||||
|
|
|
@ -0,0 +1,88 @@
|
|||
/****************************************************************************
|
||||
* fs/nxffs/nxffs_pack.c
|
||||
*
|
||||
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
|
||||
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
||||
*
|
||||
* References: Linux/Documentation/filesystems/romfs.txt
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Included Files
|
||||
****************************************************************************/
|
||||
|
||||
#include <nuttx/config.h>
|
||||
|
||||
#include <errno.h>
|
||||
|
||||
#include "nxffs.h"
|
||||
|
||||
/****************************************************************************
|
||||
* Pre-processor Definitions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Public Types
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Public Variables
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Private Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Public Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_pack
|
||||
*
|
||||
* Description:
|
||||
* Pack and re-write the filesystem in order to free up memory at the end
|
||||
* of FLASH.
|
||||
*
|
||||
* Input Parameters:
|
||||
* volume - The volume to be packed.
|
||||
*
|
||||
* Returned Values:
|
||||
* Zero on success; Otherwise, a negated errno value is returned to
|
||||
* indicate the nature of the failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
int nxffs_pack(FAR struct nxffs_volume_s *volume)
|
||||
{
|
||||
# warning "Missing logic"
|
||||
return -ENOSYS;
|
||||
}
|
|
@ -148,12 +148,10 @@ static int nxffs_format(FAR struct nxffs_volume_s *volume)
|
|||
static int nxffs_badblocks(FAR struct nxffs_volume_s *volume)
|
||||
{
|
||||
FAR uint8_t *blkptr; /* Pointer to next block data */
|
||||
FAR uint8_t *datptr; /* Pointer to next data byte */
|
||||
off_t eblock; /* Erase block number */
|
||||
off_t lblock; /* Logical block number */
|
||||
ssize_t nxfrd; /* Number of blocks transferred */
|
||||
uint16_t blkndx; /* Logical block data index */
|
||||
bool bad; /* TRUE: block is bad */
|
||||
bool good; /* TRUE: block is good */
|
||||
bool modified; /* TRUE: The erase block has been modified */
|
||||
int i;
|
||||
|
||||
|
@ -182,32 +180,19 @@ static int nxffs_badblocks(FAR struct nxffs_volume_s *volume)
|
|||
|
||||
/* Check block header */
|
||||
|
||||
bad = false;
|
||||
good = true;
|
||||
if (memcmp(blkhdr->magic, g_blockmagic, NXFFS_MAGICSIZE) != 0 ||
|
||||
blkhdr->state != BLOCK_STATE_GOOD)
|
||||
{
|
||||
bad = true;;
|
||||
good = false;
|
||||
}
|
||||
|
||||
/* Check that block data is erased */
|
||||
|
||||
else
|
||||
{
|
||||
/* Check every byte in the block payload */
|
||||
|
||||
for (blkndx = SIZEOF_NXFFS_BLOCK_HDR, datptr = &blkptr[blkndx];
|
||||
blkndx < volume->geo.blocksize;
|
||||
blkndx++)
|
||||
{
|
||||
/* If the data byte is not in the erased state, then the block is bad */
|
||||
|
||||
uint8_t byte = *datptr++;
|
||||
if (byte != CONFIG_NXFFS_ERASEDSTATE)
|
||||
{
|
||||
bad = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
good = nxffs_erased(&blkptr[SIZEOF_NXFFS_BLOCK_HDR],
|
||||
volume->geo.blocksize - SIZEOF_NXFFS_BLOCK_HDR);
|
||||
}
|
||||
|
||||
/* If the block is bad, attempt to re-write the block header indicating
|
||||
|
@ -215,7 +200,7 @@ static int nxffs_badblocks(FAR struct nxffs_volume_s *volume)
|
|||
* possible, depending upon failure modes.
|
||||
*/
|
||||
|
||||
if (bad)
|
||||
if (!good)
|
||||
{
|
||||
memcpy(blkhdr->magic, g_blockmagic, NXFFS_MAGICSIZE);
|
||||
blkhdr->state = BLOCK_STATE_BAD;
|
||||
|
|
|
@ -107,7 +107,7 @@ int nxffs_statfs(FAR struct inode *mountpt, FAR struct statfs *buf)
|
|||
memset(buf, 0, sizeof(struct statfs));
|
||||
buf->f_type = NXFFS_MAGIC;
|
||||
buf->f_bsize = volume->geo.blocksize;
|
||||
buf->f_blocks = volume->geo.neraseblocks * volume->blkper;
|
||||
buf->f_blocks = volume->nblocks;
|
||||
buf->f_namelen = volume->geo.blocksize - SIZEOF_NXFFS_BLOCK_HDR - SIZEOF_NXFFS_INODE_HDR;
|
||||
ret = OK;
|
||||
|
||||
|
|
|
@ -97,7 +97,7 @@ int nxffs_rminode(FAR struct nxffs_volume_s *volume, FAR const char *name)
|
|||
|
||||
/* Check if the file is open */
|
||||
|
||||
ofile = nxffs_findofile(name);
|
||||
ofile = nxffs_findofile(volume, name);
|
||||
if (ofile)
|
||||
{
|
||||
/* We can't remove the inode if it is open */
|
||||
|
|
|
@ -74,16 +74,37 @@
|
|||
* Input Parameters:
|
||||
* val - A pointer to the first byte of the little endian value.
|
||||
*
|
||||
* Returned Values:
|
||||
* Returned Value:
|
||||
* A uint16_t representing the whole 16-bit integer value
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
uint16_t nxffs_rdle16(const uint8_t *val)
|
||||
uint16_t nxffs_rdle16(FAR const uint8_t *val)
|
||||
{
|
||||
return (uint16_t)val[1] << 8 | (uint16_t)val[0];
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_wrle16
|
||||
*
|
||||
* Description:
|
||||
* Put a (possibly unaligned) 16-bit little endian value.
|
||||
*
|
||||
* Input Parameters:
|
||||
* dest - A pointer to the first byte to save the little endian value.
|
||||
* val - The 16-bit value to be saved.
|
||||
*
|
||||
* Returned Value:
|
||||
* None
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
void nxffs_wrle16(uint8_t *dest, uint16_t val)
|
||||
{
|
||||
dest[0] = val & 0xff; /* Little endian means LS byte first in byte stream */
|
||||
dest[1] = val >> 8;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_rdle32
|
||||
*
|
||||
|
@ -93,15 +114,65 @@ uint16_t nxffs_rdle16(const uint8_t *val)
|
|||
* Input Parameters:
|
||||
* val - A pointer to the first byte of the little endian value.
|
||||
*
|
||||
* Returned Values:
|
||||
* Returned Value:
|
||||
* A uint32_t representing the whole 32-bit integer value
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
uint32_t nxffs_rdle32(const uint8_t *val)
|
||||
uint32_t nxffs_rdle32(FAR const uint8_t *val)
|
||||
{
|
||||
/* Little endian means LS halfword first in byte stream */
|
||||
|
||||
return (uint32_t)nxffs_rdle16(&val[2]) << 16 | (uint32_t)nxffs_rdle16(val);
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_wrle32
|
||||
*
|
||||
* Description:
|
||||
* Put a (possibly unaligned) 32-bit little endian value.
|
||||
*
|
||||
* Input Parameters:
|
||||
* dest - A pointer to the first byte to save the little endian value.
|
||||
* val - The 32-bit value to be saved.
|
||||
*
|
||||
* Returned Value:
|
||||
* None
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
void nxffs_wrle32(uint8_t *dest, uint32_t val)
|
||||
{
|
||||
/* Little endian means LS halfword first in byte stream */
|
||||
|
||||
nxffs_wrle16(dest, (uint16_t)(val & 0xffff));
|
||||
nxffs_wrle16(dest+2, (uint16_t)(val >> 16));
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_erased
|
||||
*
|
||||
* Description:
|
||||
* Check if the block of memory if in the erased state.
|
||||
*
|
||||
* Input Parameters:
|
||||
* buffer - Address of the start of the memory to check.
|
||||
* buflen - The number of bytes to check.
|
||||
*
|
||||
* Returned Values:
|
||||
* true: memory is erased; false: memory is not erased
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
bool nxffs_erased(FAR const uint8_t *buffer, size_t buflen)
|
||||
{
|
||||
for (; buflen; buflen--)
|
||||
{
|
||||
if (*buffer != CONFIG_NXFFS_ERASEDSTATE)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
buffer++;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
|
|
@ -145,3 +145,249 @@ errout_with_semaphore:
|
|||
errout:
|
||||
return ret;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_wrreserve
|
||||
*
|
||||
* Description:
|
||||
* Find a valid location for a file system object of 'size'. A valid
|
||||
* location will have these properties:
|
||||
*
|
||||
* 1. It will lie in the free flash region.
|
||||
* 2. It will have enough contiguous memory to hold the entire object
|
||||
* 3. The memory at this location will be fully erased.
|
||||
*
|
||||
* This function will only perform the checks of 1) and 2). The
|
||||
* end-of-filesystem offset, froffset, is update past this memory which,
|
||||
* in effect, reserves the memory.
|
||||
*
|
||||
* Input Parameters:
|
||||
* volume - Describes the NXFFS volume
|
||||
* size - The size of the object to be reserved.
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero is returned on success. Otherwise, a negated errno value is
|
||||
* returned indicating the nature of the failure. Of special interest
|
||||
* the return error of -ENOSPC which means that the FLASH volume is
|
||||
* full and should be repacked.
|
||||
*
|
||||
* On successful return the following are also valid:
|
||||
*
|
||||
* volume->ioblock - Read/write block number of the block containing the
|
||||
* candidate oject position
|
||||
* volume->iooffset - The offset in the block to the candidate object
|
||||
* position.
|
||||
* volume->froffset - Updated offset to the first free FLASH block after
|
||||
* the reserved memory.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
int nxffs_wrreserve(FAR struct nxffs_volume_s *volume, size_t size)
|
||||
{
|
||||
off_t offset;
|
||||
int ret;
|
||||
|
||||
/* Seek to the beginning of the free FLASH region */
|
||||
|
||||
offset = volume->froffset;
|
||||
nxffs_ioseek(volume, offset);
|
||||
|
||||
/* Check for a seek past the end of the volume */
|
||||
|
||||
if (volume->ioblock >= volume->nblocks)
|
||||
{
|
||||
/* Return -ENOSPC to indicate that the volume is full */
|
||||
|
||||
return -ENOSPC;
|
||||
}
|
||||
|
||||
/* Make sure that there is space there to hold the entire object */
|
||||
|
||||
DEBUGASSERT(volume->iooffset >= SIZEOF_NXFFS_BLOCK_HDR);
|
||||
if (volume->iooffset + size > volume->geo.blocksize)
|
||||
{
|
||||
/* We will need to skip to the next block. But first, check if we are
|
||||
* already at the final block.
|
||||
*/
|
||||
|
||||
if (volume->ioblock + 1 >= volume->geo.neraseblocks)
|
||||
{
|
||||
/* Return -ENOSPC to indicate that the volume is full */
|
||||
|
||||
fdbg("No space in last block\n");
|
||||
return -ENOSPC;
|
||||
}
|
||||
|
||||
/* This is not the last block in the volume, so just seek to the
|
||||
* beginning of the next, valid block.
|
||||
*/
|
||||
|
||||
volume->ioblock++;
|
||||
ret = nxffs_validblock(volume, &volume->ioblock);
|
||||
if (ret < 0)
|
||||
{
|
||||
fdbg("No more valid blocks\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
volume->iooffset = SIZEOF_NXFFS_BLOCK_HDR;
|
||||
offset = volume->ioblock * volume->geo.blocksize + SIZEOF_NXFFS_BLOCK_HDR;
|
||||
}
|
||||
|
||||
/* Update the pointer to the first next free FLASH memory -- reserving this
|
||||
* block of memory.
|
||||
*/
|
||||
|
||||
volume->froffset = offset + size;
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_wrverify
|
||||
*
|
||||
* Description:
|
||||
* Find a valid location for the object. A valid location will have
|
||||
* these properties:
|
||||
*
|
||||
* 1. It will lie in the free flash region.
|
||||
* 2. It will have enough contiguous memory to hold the entire header
|
||||
* (excluding the file name which may lie in the next block).
|
||||
* 3. The memory at this location will be fully erased.
|
||||
*
|
||||
* This function will only perform the check 3). On entry it assumes the
|
||||
* following settings (left by nxffs_wrreserve()):
|
||||
*
|
||||
* volume->ioblock - Read/write block number of the block containing the
|
||||
* candidate oject position
|
||||
* volume->iooffset - The offset in the block to the candidate object
|
||||
* position.
|
||||
*
|
||||
* Input Parameters:
|
||||
* volume - Describes the NXFFS volume
|
||||
* size - The size of the object to be verifed.
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero is returned on success. Otherwise, a negated errno value is
|
||||
* returned indicating the nature of the failure. Of special interest
|
||||
* the return error of -ENOSPC which means that the FLASH volume is
|
||||
* full and should be repacked.
|
||||
*
|
||||
* On successful return the following are also valid:
|
||||
*
|
||||
* volume->ioblock - Read/write block number of the block containing the
|
||||
* verified object position
|
||||
* volume->iooffset - The offset in the block to the verified object
|
||||
* position.
|
||||
* volume->froffset - Updated offset to the first free FLASH block.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
int nxffs_wrverify(FAR struct nxffs_volume_s *volume, size_t size)
|
||||
{
|
||||
uint16_t iooffset;
|
||||
int nerased;
|
||||
int ret;
|
||||
int i;
|
||||
|
||||
/* Search to the very last block in the volume if we have to */
|
||||
|
||||
while (volume->ioblock < volume->nblocks)
|
||||
{
|
||||
/* Make sure that the block is in memory */
|
||||
|
||||
ret = nxffs_rdcache(volume, volume->ioblock, 1);
|
||||
if (ret < 0)
|
||||
{
|
||||
fdbg("nxffsx_rdcache failed: %d\n", -ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Search to the very end of this block if we have to */
|
||||
|
||||
iooffset = volume->iooffset;
|
||||
nerased = 0;
|
||||
|
||||
for (i = volume->iooffset; i <= volume->geo.blocksize - size; i++)
|
||||
{
|
||||
/* Is this byte erased? */
|
||||
|
||||
if (volume->cache[i] == CONFIG_NXFFS_ERASEDSTATE)
|
||||
{
|
||||
/* Yes.. increment the count of contiguous, erased bytes */
|
||||
|
||||
nerased++;
|
||||
|
||||
/* Is the whole header memory erased? */
|
||||
|
||||
if (nerased >= size)
|
||||
{
|
||||
/* Yes.. this this is where we will put the object */
|
||||
|
||||
off_t offset = volume->ioblock * volume->geo.blocksize + iooffset;
|
||||
|
||||
/* Update the free flash offset and return success */
|
||||
|
||||
volume->froffset = offset + size;
|
||||
return OK;
|
||||
}
|
||||
}
|
||||
|
||||
/* This byte is not erased! (It should be unless the block is bad) */
|
||||
|
||||
else
|
||||
{
|
||||
nerased = 0;
|
||||
iooffset = volume->iooffset + 1;
|
||||
}
|
||||
}
|
||||
|
||||
/* If we get here, then we have looked at every byte in the the block
|
||||
* and did not find any sequence of erased bytes long enough to hold
|
||||
* the object. Skip to the next, valid block.
|
||||
*/
|
||||
|
||||
volume->ioblock++;
|
||||
ret = nxffs_validblock(volume, &volume->ioblock);
|
||||
if (ret < 0)
|
||||
{
|
||||
fdbg("No more valid blocks\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
volume->iooffset = size;
|
||||
volume->froffset = volume->ioblock * volume->geo.blocksize + size;
|
||||
}
|
||||
|
||||
/* Return -ENOSPC if there is no erased memory left in the volume for
|
||||
* the object.
|
||||
*/
|
||||
|
||||
fdbg("Not enough memory left to hold the file header\n");
|
||||
return -ENOSPC;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nxffs_wrblkhdr
|
||||
*
|
||||
* Description:
|
||||
* Write the block header information. This is done (1) whenever the end-
|
||||
* block is encountered and (2) also when the file is closed in order to
|
||||
* flush the final block of data to FLASH.
|
||||
*
|
||||
* Input Parameters:
|
||||
* volume - Describes the state of the NXFFS volume
|
||||
* wrfile - Describes the state of the open file
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero is returned on success; Otherwise, a negated errno value is
|
||||
* returned to indicate the nature of the failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
int nxffs_wrblkhdr(FAR struct nxffs_volume_s *volume,
|
||||
FAR struct nxffs_wrfile_s *wrfile)
|
||||
{
|
||||
#warning "Missing logic"
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
|
|
Loading…
Reference in New Issue