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Fix an error in FAT needed for interoperability with Windows when access first entry in root directory

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4093 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2011-11-15 22:37:14 +00:00
parent 0fe0a10e9f
commit bdd0e9e973
5 changed files with 111 additions and 30 deletions
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4
ChangeLog
View File

@ -2210,3 +2210,7 @@
* drivers/mmcsd0/mmcsd_sdio.c: Increase capacity variable from size_t
to uin64_t (if available) so that SD cards with capacities greater
than 4Gb can be supported.
* fs/fat/fs_fat32dirent.c: The root directory structure is different
from other directories. When formatted by Windows, it is not initialized
at all. Some additional special handling is required to initialize the
root directory entry to interoperate correctly with windows.

12
TODO
View File

@ -1,4 +1,4 @@
NuttX TODO List (Last updated October 3, 2011)
NuttX TODO List (Last updated November 15, 2011)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This file summarizes known NuttX bugs, limitations, inconsistencies with
@ -16,7 +16,7 @@ nuttx/
(16) Network (net/, drivers/net)
(2) USB (drivers/usbdev, drivers/usbhost)
(7) Libraries (lib/)
(9) File system/Generic drivers (fs/, drivers/)
(10) File system/Generic drivers (fs/, drivers/)
(2) Graphics subystem (graphics/)
(1) Pascal add-on (pcode/)
(1) Documentation (Documentation/)
@ -501,6 +501,14 @@ o File system / Generic drivers (fs/, drivers/)
Status: Open
Priority: Medium
Description: mkfatfs() does not create the "." directory entry (all directories)
or the ".." directory entry (all directories except for the root
directory). NuttX doesn't care about these entries, but this will
probably make a FAT filesystem formatted on NuttX unusable under
Windows.
Status: Open
Priority: High
o Graphics subystem (graphics/)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

4
arch/mips/include/mips32/syscall.h
View File

@ -148,7 +148,7 @@
/* Context switching system calls ***************************************************/
/* SYS call 0:
/* SYS call 1:
*
* void up_fullcontextrestore(uint32_t *restoreregs) __attribute__ ((noreturn));
*/
@ -157,7 +157,7 @@
#define up_fullcontextrestore(restoreregs) \
(void)sys_call1(SYS_restore_context, (uintptr_t)restoreregs)
/* SYS call 1:
/* SYS call 2:
*
* void up_switchcontext(uint32_t *saveregs, uint32_t *restoreregs);
*/

15
fs/fat/fs_fat32.c
View File

@ -1295,12 +1295,13 @@ static int fat_opendir(struct inode *mountpt, const char *relpath, struct fs_dir
else if ((DIR_GETATTRIBUTES(direntry) & FATATTR_DIRECTORY) == 0)
{
/* The entry is not a directory */
ret = -ENOTDIR;
goto errout_with_semaphore;
}
else
{
/* The entry is a directory */
/* The entry is a directory (but not the root directory) */
dir->u.fat.fd_startcluster =
((uint32_t)DIR_GETFSTCLUSTHI(direntry) << 16) |
@ -1492,7 +1493,9 @@ static int fat_rewinddir(struct inode *mountpt, struct fs_dirent_s *dir)
goto errout_with_semaphore;
}
/* Check if this is the root directory */
/* Check if this is the root directory. If it is the root directory, we
* reset the fd_index to 1, skipping over the initial, unused entry.
*/
if (fs->fs_type != FSTYPE_FAT32 &&
dir->u.fat.fd_startcluster == 0)
@ -1501,7 +1504,7 @@ static int fat_rewinddir(struct inode *mountpt, struct fs_dirent_s *dir)
dir->u.fat.fd_currcluster = 0;
dir->u.fat.fd_currsector = fs->fs_rootbase;
dir->u.fat.fd_index = 0;
dir->u.fat.fd_index = 1;
}
else if (fs->fs_type == FSTYPE_FAT32 &&
dir->u.fat.fd_startcluster == fs->fs_rootbase)
@ -1510,10 +1513,12 @@ static int fat_rewinddir(struct inode *mountpt, struct fs_dirent_s *dir)
dir->u.fat.fd_currcluster = dir->u.fat.fd_startcluster;
dir->u.fat.fd_currsector = fat_cluster2sector(fs, fs->fs_rootbase);
dir->u.fat.fd_index = 0;
dir->u.fat.fd_index = 1;
}
/* This is not the root directory */
/* This is not the root directory. Here the fd_index is set to 2, skipping over
* both the "." and ".." entries.
*/
else
{

106
fs/fat/fs_fat32dirent.c
View File

@ -144,6 +144,8 @@ static inline int fat_getsfname(uint8_t *direntry, char *buffer,
static void fat_getlfnchunk(uint8_t *chunk, uint8_t *dest, int nchunk);
static inline int fat_getlfname(struct fat_mountpt_s *fs, struct fs_dirent_s *dir);
#endif
static int fat_dirverify(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo,
uint16_t offset);
static int fat_putsfname(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo);
#ifdef CONFIG_FAT_LFN
static void fat_initlfname(uint8_t *chunk, int nchunk);
@ -792,13 +794,14 @@ static inline int fat_findalias(struct fat_mountpt_s *fs,
memcpy(&tmpinfo, dirinfo, sizeof(struct fat_dirinfo_s));
/* Then re-initialize to the beginning of the current directory (skipping
* '.' and '..').
/* Then re-initialize to the beginning of the current directory, skipping
* over the first entry (unused in the root directory and '.' entry in other
* directories).
*/
tmpinfo.dir.fd_startcluster = tmpinfo.dir.fd_currcluster;
tmpinfo.dir.fd_currsector = tmpinfo.fd_seq.ds_startsector;
tmpinfo.dir.fd_index = 2;
tmpinfo.dir.fd_index = 1;
/* Search for the single short file name directory entry in this directory */
@ -1908,6 +1911,56 @@ static inline int fat_getlfname(struct fat_mountpt_s *fs, struct fs_dirent_s *di
}
#endif
/****************************************************************************
* Name: fat_dirverify
*
* Desciption:
* Verify that every entry preceding this one is marked with something
* other than DIR0_ALLEMPTY. This is necessary only in the root directory
* of freshly formatted volumes. In that case, all entries are set to
* zero.
*
* This function also assures that the sector containing the entry is in
* the sector cache.
*
****************************************************************************/
static int fat_dirverify(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo,
uint16_t offset)
{
uint8_t *direntry;
uint16_t i;
int ret;
/* Make sure that the sector containing the directory entry is in the sector
* cache.
*/
ret = fat_fscacheread(fs, dirinfo->dir.fd_currsector);
if (ret < 0)
{
return ret;
}
/* Check every entry preceding this one */
for (i = 0; i < offset; i += DIR_SIZE)
{
/* Is the rest of the directory marked empty? */
direntry = &fs->fs_buffer[i];
if (direntry[DIR_NAME] == DIR0_ALLEMPTY)
{
/* Then mark the just the entry as empty */
fs->fs_dirty = true;
direntry[DIR_NAME] = DIR0_EMPTY;
}
}
return OK;
}
/****************************************************************************
* Name: fat_putsfname
*
@ -1921,6 +1974,8 @@ static int fat_putsfname(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo
{
uint8_t *direntry = &fs->fs_buffer[dirinfo->fd_seq.ds_offset];
/* Write the short directory entry */
memcpy(&direntry[DIR_NAME], dirinfo->fd_name, DIR_MAXFNAME);
#ifdef CONFIG_FAT_LCNAMES
DIR_PUTNTRES(direntry, dirinfo->fd_ntflags);
@ -2012,6 +2067,12 @@ static int fat_putlfname(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo
int namelen;
int ret;
/* Some special handling in case we are writing the first entry of the
* root directory in a freshly formatted volume.
*/
(void)fat_dirverify(fs, dirinfo, dirinfo->fd_seq.ds_lfnoffset);
/* Get the length of the long file name (size of the fd_lfname array is
* LDIR_MAXFNAME+1 we do not have to check the length of the string).
* NOTE that remainder is conditionally incremented to include the NUL
@ -2065,18 +2126,11 @@ static int fat_putlfname(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo
seqno = LDIR0_LAST | nentries;
/* Make sure that the sector containing the "last" long file name entry
* is in the sector cache (it probably is not).
/* Now loop, writing each long file name entry. We know that the sector
* is in the sector cache because fat_dirverify() assures us that that is
* so.
*/
ret = fat_fscacheread(fs, dirinfo->dir.fd_currsector);
if (ret < 0)
{
return ret;
}
/* Now loop, writing each long file name entry */
for (;;)
{
/* Get the string offset associated with the directory entry. */
@ -2201,6 +2255,12 @@ static int fat_putsfdirentry(struct fat_mountpt_s *fs,
{
uint8_t *direntry;
/* Some special handling in case we are writing the first entry of the
* root directory in a freshly formatted volume.
*/
(void)fat_dirverify(fs, dirinfo, dirinfo->fd_seq.ds_offset);
/* Initialize the 32-byte directory entry */
direntry = &fs->fs_buffer[dirinfo->fd_seq.ds_offset];
@ -2276,11 +2336,11 @@ int fat_finddirentry(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo,
dirinfo->dir.fd_currsector = cluster;
}
/* fd_index is the index into the current directory table. Skipping over
* the '.' and '..' entries.
/* fd_index is the index into the current directory table. It is set to one
* to skip over the first, unused entry in the root directory.
*/
dirinfo->dir.fd_index = 2;
dirinfo->dir.fd_index = 1;
/* If no path was provided, then the root directory must be exactly what
* the caller is looking for.
@ -2377,7 +2437,10 @@ int fat_finddirentry(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo,
((uint32_t)DIR_GETFSTCLUSTHI(direntry) << 16) |
DIR_GETFSTCLUSTLO(direntry);
/* Then restart scanning at the new directory */
/* Then restart scanning at the new directory, skipping over both the
* '.' and '..' entries that exist in all directories EXCEPT the root
* directory.
*/
dirinfo->dir.fd_startcluster = cluster;
dirinfo->dir.fd_currcluster = cluster;
@ -2426,9 +2489,9 @@ int fat_allocatedirentry(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo
dirinfo->dir.fd_currsector = fs->fs_rootbase;
}
/* Skip over the '.' and '..' entries */
/* Skip over the first, unused entry in the root directory. */
dirinfo->dir.fd_index = 2;
dirinfo->dir.fd_index = 1;
/* Is this a path segment a long or a short file. Was a long file
* name parsed?
@ -2835,8 +2898,9 @@ int fat_remove(struct fat_mountpt_s *fs, const char *relpath, bool directory)
return -EISDIR;
}
/* We are asked to delete a directory. Check if this
* sub-directory is empty
/* We are asked to delete a directory. Check if this sub-directory is
* empty (i.e., that there are no valid entries other than the initial
* '.' and '..' entries).
*/
dirinfo.dir.fd_currcluster = dircluster;