| (de - (struct msdos_dir_entry *)bh->b_data);
}
+static inline void fat_dir_readahead(struct inode *dir, sector_t iblock,
+ sector_t phys)
+{
+ struct super_block *sb = dir->i_sb;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ struct buffer_head *bh;
+ int sec;
+
+ /* This is not a first sector of cluster, or sec_per_clus == 1 */
+ if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1)
+ return;
+ /* root dir of FAT12/FAT16 */
+ if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO))
+ return;
+
+ bh = sb_find_get_block(sb, phys);
+ if (bh == NULL || !buffer_uptodate(bh)) {
+ for (sec = 0; sec < sbi->sec_per_clus; sec++)
+ sb_breadahead(sb, phys + sec);
+ }
+ brelse(bh);
+}
+
/* Returns the inode number of the directory entry at offset pos. If bh is
non-NULL, it is brelse'd before. Pos is incremented. The buffer header is
returned in bh.
{
struct super_block *sb = dir->i_sb;
sector_t phys, iblock;
- int offset;
- int err;
+ unsigned long mapped_blocks;
+ int err, offset;
next:
if (*bh)
*bh = NULL;
iblock = *pos >> sb->s_blocksize_bits;
- err = fat_bmap(dir, iblock, &phys);
+ err = fat_bmap(dir, iblock, &phys, &mapped_blocks);
if (err || !phys)
return -1; /* beyond EOF or error */
+ fat_dir_readahead(dir, iblock, phys);
+
*bh = sb_bread(sb, phys);
if (*bh == NULL) {
printk(KERN_ERR "FAT: Directory bread(block %llu) failed\n",
}
/*
- * Convert Unicode 16 to UTF8, translated Unicode, or ASCII.
+ * Convert Unicode 16 to UTF-8, translated Unicode, or ASCII.
* If uni_xlate is enabled and we can't get a 1:1 conversion, use a
* colon as an escape character since it is normally invalid on the vfat
* filesystem. The following four characters are the hexadecimal digits
return len;
}
+enum { PARSE_INVALID = 1, PARSE_NOT_LONGNAME, PARSE_EOF, };
+
+/**
+ * fat_parse_long - Parse extended directory entry.
+ *
+ * This function returns zero on success, negative value on error, or one of
+ * the following:
+ *
+ * %PARSE_INVALID - Directory entry is invalid.
+ * %PARSE_NOT_LONGNAME - Directory entry does not contain longname.
+ * %PARSE_EOF - Directory has no more entries.
+ */
+static int fat_parse_long(struct inode *dir, loff_t *pos,
+ struct buffer_head **bh, struct msdos_dir_entry **de,
+ wchar_t **unicode, unsigned char *nr_slots)
+{
+ struct msdos_dir_slot *ds;
+ unsigned char id, slot, slots, alias_checksum;
+
+ if (!*unicode) {
+ *unicode = (wchar_t *)__get_free_page(GFP_KERNEL);
+ if (!*unicode) {
+ brelse(*bh);
+ return -ENOMEM;
+ }
+ }
+parse_long:
+ slots = 0;
+ ds = (struct msdos_dir_slot *)*de;
+ id = ds->id;
+ if (!(id & 0x40))
+ return PARSE_INVALID;
+ slots = id & ~0x40;
+ if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */
+ return PARSE_INVALID;
+ *nr_slots = slots;
+ alias_checksum = ds->alias_checksum;
+
+ slot = slots;
+ while (1) {
+ int offset;
+
+ slot--;
+ offset = slot * 13;
+ fat16_towchar(*unicode + offset, ds->name0_4, 5);
+ fat16_towchar(*unicode + offset + 5, ds->name5_10, 6);
+ fat16_towchar(*unicode + offset + 11, ds->name11_12, 2);
+
+ if (ds->id & 0x40)
+ (*unicode)[offset + 13] = 0;
+ if (fat_get_entry(dir, pos, bh, de) < 0)
+ return PARSE_EOF;
+ if (slot == 0)
+ break;
+ ds = (struct msdos_dir_slot *)*de;
+ if (ds->attr != ATTR_EXT)
+ return PARSE_NOT_LONGNAME;
+ if ((ds->id & ~0x40) != slot)
+ goto parse_long;
+ if (ds->alias_checksum != alias_checksum)
+ goto parse_long;
+ }
+ if ((*de)->name[0] == DELETED_FLAG)
+ return PARSE_INVALID;
+ if ((*de)->attr == ATTR_EXT)
+ goto parse_long;
+ if (IS_FREE((*de)->name) || ((*de)->attr & ATTR_VOLUME))
+ return PARSE_INVALID;
+ if (fat_checksum((*de)->name) != alias_checksum)
+ *nr_slots = 0;
+
+ return 0;
+}
+
/*
* Return values: negative -> error, 0 -> not found, positive -> found,
* value is the total amount of slots, including the shortname entry.
if (de->attr != ATTR_EXT && IS_FREE(de->name))
continue;
if (de->attr == ATTR_EXT) {
- struct msdos_dir_slot *ds;
- unsigned char id;
- unsigned char slot;
- unsigned char slots;
- unsigned char sum;
- unsigned char alias_checksum;
-
- if (!unicode) {
- unicode = (wchar_t *)
- __get_free_page(GFP_KERNEL);
- if (!unicode) {
- brelse(bh);
- return -ENOMEM;
- }
- }
-parse_long:
- slots = 0;
- ds = (struct msdos_dir_slot *) de;
- id = ds->id;
- if (!(id & 0x40))
- continue;
- slots = id & ~0x40;
- if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */
+ int status = fat_parse_long(inode, &cpos, &bh, &de,
+ &unicode, &nr_slots);
+ if (status < 0)
+ return status;
+ else if (status == PARSE_INVALID)
continue;
- nr_slots = slots;
- alias_checksum = ds->alias_checksum;
-
- slot = slots;
- while (1) {
- int offset;
-
- slot--;
- offset = slot * 13;
- fat16_towchar(unicode + offset, ds->name0_4, 5);
- fat16_towchar(unicode + offset + 5, ds->name5_10, 6);
- fat16_towchar(unicode + offset + 11, ds->name11_12, 2);
-
- if (ds->id & 0x40) {
- unicode[offset + 13] = 0;
- }
- if (fat_get_entry(inode, &cpos, &bh, &de) < 0)
- goto EODir;
- if (slot == 0)
- break;
- ds = (struct msdos_dir_slot *) de;
- if (ds->attr != ATTR_EXT)
- goto parse_record;
- if ((ds->id & ~0x40) != slot)
- goto parse_long;
- if (ds->alias_checksum != alias_checksum)
- goto parse_long;
- }
- if (de->name[0] == DELETED_FLAG)
- continue;
- if (de->attr == ATTR_EXT)
- goto parse_long;
- if (IS_FREE(de->name) || (de->attr & ATTR_VOLUME))
- continue;
- for (sum = 0, i = 0; i < 11; i++)
- sum = (((sum&1)<<7)|((sum&0xfe)>>1)) + de->name[i];
- if (sum != alias_checksum)
- nr_slots = 0;
+ else if (status == PARSE_NOT_LONGNAME)
+ goto parse_record;
+ else if (status == PARSE_EOF)
+ goto EODir;
}
memcpy(work, de->name, sizeof(de->name));
return err;
}
-EXPORT_SYMBOL(fat_search_long);
+EXPORT_SYMBOL_GPL(fat_search_long);
struct fat_ioctl_filldir_callback {
struct dirent __user *dirent;
int short_len;
};
-static int fat_readdirx(struct inode *inode, struct file *filp, void *dirent,
- filldir_t filldir, int short_only, int both)
+static int __fat_readdir(struct inode *inode, struct file *filp, void *dirent,
+ filldir_t filldir, int short_only, int both)
{
struct super_block *sb = inode->i_sb;
struct msdos_sb_info *sbi = MSDOS_SB(sb);
bh = NULL;
GetNew:
- long_slots = 0;
if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
goto EODir;
+parse_record:
+ long_slots = 0;
/* Check for long filename entry */
if (isvfat) {
if (de->name[0] == DELETED_FLAG)
}
if (isvfat && de->attr == ATTR_EXT) {
- struct msdos_dir_slot *ds;
- unsigned char id;
- unsigned char slot;
- unsigned char slots;
- unsigned char sum;
- unsigned char alias_checksum;
-
- if (!unicode) {
- unicode = (wchar_t *)__get_free_page(GFP_KERNEL);
- if (!unicode) {
- filp->f_pos = cpos;
- brelse(bh);
- ret = -ENOMEM;
- goto out;
- }
- }
-ParseLong:
- slots = 0;
- ds = (struct msdos_dir_slot *) de;
- id = ds->id;
- if (!(id & 0x40))
- goto RecEnd;
- slots = id & ~0x40;
- if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */
+ int status = fat_parse_long(inode, &cpos, &bh, &de,
+ &unicode, &long_slots);
+ if (status < 0) {
+ filp->f_pos = cpos;
+ ret = status;
+ goto out;
+ } else if (status == PARSE_INVALID)
goto RecEnd;
- long_slots = slots;
- alias_checksum = ds->alias_checksum;
-
- slot = slots;
- while (1) {
- int offset;
-
- slot--;
- offset = slot * 13;
- fat16_towchar(unicode + offset, ds->name0_4, 5);
- fat16_towchar(unicode + offset + 5, ds->name5_10, 6);
- fat16_towchar(unicode + offset + 11, ds->name11_12, 2);
-
- if (ds->id & 0x40) {
- unicode[offset + 13] = 0;
- }
- if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
- goto EODir;
- if (slot == 0)
- break;
- ds = (struct msdos_dir_slot *) de;
- if (ds->attr != ATTR_EXT)
- goto RecEnd; /* XXX */
- if ((ds->id & ~0x40) != slot)
- goto ParseLong;
- if (ds->alias_checksum != alias_checksum)
- goto ParseLong;
- }
- if (de->name[0] == DELETED_FLAG)
- goto RecEnd;
- if (de->attr == ATTR_EXT)
- goto ParseLong;
- if (IS_FREE(de->name) || (de->attr & ATTR_VOLUME))
- goto RecEnd;
- for (sum = 0, i = 0; i < 11; i++)
- sum = (((sum&1)<<7)|((sum&0xfe)>>1)) + de->name[i];
- if (sum != alias_checksum)
- long_slots = 0;
+ else if (status == PARSE_NOT_LONGNAME)
+ goto parse_record;
+ else if (status == PARSE_EOF)
+ goto EODir;
}
if (sbi->options.dotsOK) {
EODir:
filp->f_pos = cpos;
FillFailed:
- if (bh)
- brelse(bh);
+ brelse(bh);
if (unicode)
free_page((unsigned long)unicode);
out:
static int fat_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct inode *inode = filp->f_dentry->d_inode;
- return fat_readdirx(inode, filp, dirent, filldir, 0, 0);
+ return __fat_readdir(inode, filp, dirent, filldir, 0, 0);
}
static int fat_ioctl_filldir(void *__buf, const char *name, int name_len,
buf.dirent = d1;
buf.result = 0;
- down(&inode->i_sem);
+ mutex_lock(&inode->i_mutex);
ret = -ENOENT;
if (!IS_DEADDIR(inode)) {
- ret = fat_readdirx(inode, filp, &buf, fat_ioctl_filldir,
- short_only, both);
+ ret = __fat_readdir(inode, filp, &buf, fat_ioctl_filldir,
+ short_only, both);
}
- up(&inode->i_sem);
+ mutex_unlock(&inode->i_mutex);
if (ret >= 0)
ret = buf.result;
return ret;
}
-struct file_operations fat_dir_operations = {
+const struct file_operations fat_dir_operations = {
.read = generic_read_dir,
.readdir = fat_readdir,
.ioctl = fat_dir_ioctl,
return -ENOENT;
}
-EXPORT_SYMBOL(fat_get_dotdot_entry);
+EXPORT_SYMBOL_GPL(fat_get_dotdot_entry);
/* See if directory is empty */
int fat_dir_empty(struct inode *dir)
return result;
}
-EXPORT_SYMBOL(fat_dir_empty);
+EXPORT_SYMBOL_GPL(fat_dir_empty);
/*
* fat_subdirs counts the number of sub-directories of dir. It can be run
return -ENOENT;
}
-EXPORT_SYMBOL(fat_scan);
+EXPORT_SYMBOL_GPL(fat_scan);
static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots)
{
return 0;
}
-EXPORT_SYMBOL(fat_remove_entries);
+EXPORT_SYMBOL_GPL(fat_remove_entries);
static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used,
struct buffer_head **bhs, int nr_bhs)
return err;
}
-EXPORT_SYMBOL(fat_alloc_new_dir);
+EXPORT_SYMBOL_GPL(fat_alloc_new_dir);
static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots,
int *nr_cluster, struct msdos_dir_entry **de,
return err;
}
-EXPORT_SYMBOL(fat_add_entries);
+EXPORT_SYMBOL_GPL(fat_add_entries);
git://git.onelab.eu / linux-2.6.git / blobdiff