#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/seq_file.h>
-#include <linux/msdos_fs.h>
#include <linux/pagemap.h>
#include <linux/mpage.h>
#include <linux/buffer_head.h>
#include <linux/uio.h>
#include <linux/writeback.h>
#include <linux/log2.h>
+#include <linux/hash.h>
#include <asm/unaligned.h>
+#include "fat.h"
#ifndef CONFIG_FAT_DEFAULT_IOCHARSET
/* if user don't select VFAT, this is undefined. */
if (rw == WRITE) {
/*
- * FIXME: blockdev_direct_IO() doesn't use ->prepare_write(),
+ * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
* so we need to update the ->mmu_private to block boundary.
*
* But we must fill the remaining area or hole by nul for
INIT_HLIST_HEAD(&sbi->inode_hashtable[i]);
}
-static inline unsigned long fat_hash(struct super_block *sb, loff_t i_pos)
+static inline unsigned long fat_hash(loff_t i_pos)
{
- unsigned long tmp = (unsigned long)i_pos | (unsigned long) sb;
- tmp = tmp + (tmp >> FAT_HASH_BITS) + (tmp >> FAT_HASH_BITS * 2);
- return tmp & FAT_HASH_MASK;
+ return hash_32(i_pos, FAT_HASH_BITS);
}
void fat_attach(struct inode *inode, loff_t i_pos)
{
- struct super_block *sb = inode->i_sb;
- struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+ struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos);
spin_lock(&sbi->inode_hash_lock);
MSDOS_I(inode)->i_pos = i_pos;
- hlist_add_head(&MSDOS_I(inode)->i_fat_hash,
- sbi->inode_hashtable + fat_hash(sb, i_pos));
+ hlist_add_head(&MSDOS_I(inode)->i_fat_hash, head);
spin_unlock(&sbi->inode_hash_lock);
}
-
EXPORT_SYMBOL_GPL(fat_attach);
void fat_detach(struct inode *inode)
hlist_del_init(&MSDOS_I(inode)->i_fat_hash);
spin_unlock(&sbi->inode_hash_lock);
}
-
EXPORT_SYMBOL_GPL(fat_detach);
struct inode *fat_iget(struct super_block *sb, loff_t i_pos)
{
struct msdos_sb_info *sbi = MSDOS_SB(sb);
- struct hlist_head *head = sbi->inode_hashtable + fat_hash(sb, i_pos);
+ struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos);
struct hlist_node *_p;
struct msdos_inode_info *i;
struct inode *inode = NULL;
MSDOS_I(inode)->i_attrs = de->attr & ATTR_UNUSED;
inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
& ~((loff_t)sbi->cluster_size - 1)) >> 9;
- inode->i_mtime.tv_sec =
- date_dos2unix(le16_to_cpu(de->time), le16_to_cpu(de->date),
- sbi->options.tz_utc);
- inode->i_mtime.tv_nsec = 0;
+
+ fat_time_fat2unix(sbi, &inode->i_mtime, de->time, de->date, 0);
if (sbi->options.isvfat) {
- int secs = de->ctime_cs / 100;
- int csecs = de->ctime_cs % 100;
- inode->i_ctime.tv_sec =
- date_dos2unix(le16_to_cpu(de->ctime),
- le16_to_cpu(de->cdate),
- sbi->options.tz_utc) + secs;
- inode->i_ctime.tv_nsec = csecs * 10000000;
- inode->i_atime.tv_sec =
- date_dos2unix(0, le16_to_cpu(de->adate),
- sbi->options.tz_utc);
- inode->i_atime.tv_nsec = 0;
+ fat_time_fat2unix(sbi, &inode->i_ctime, de->ctime,
+ de->cdate, de->ctime_cs);
+ fat_time_fat2unix(sbi, &inode->i_atime, 0, de->adate, 0);
} else
inode->i_ctime = inode->i_atime = inode->i_mtime;
struct buffer_head *bh;
struct msdos_dir_entry *raw_entry;
loff_t i_pos;
- int err = 0;
+ int err;
retry:
i_pos = MSDOS_I(inode)->i_pos;
if (inode->i_ino == MSDOS_ROOT_INO || !i_pos)
return 0;
- lock_super(sb);
bh = sb_bread(sb, i_pos >> sbi->dir_per_block_bits);
if (!bh) {
printk(KERN_ERR "FAT: unable to read inode block "
"for updating (i_pos %lld)\n", i_pos);
- err = -EIO;
- goto out;
+ return -EIO;
}
spin_lock(&sbi->inode_hash_lock);
if (i_pos != MSDOS_I(inode)->i_pos) {
spin_unlock(&sbi->inode_hash_lock);
brelse(bh);
- unlock_super(sb);
goto retry;
}
raw_entry->attr = fat_attr(inode);
raw_entry->start = cpu_to_le16(MSDOS_I(inode)->i_logstart);
raw_entry->starthi = cpu_to_le16(MSDOS_I(inode)->i_logstart >> 16);
- fat_date_unix2dos(inode->i_mtime.tv_sec, &raw_entry->time,
- &raw_entry->date, sbi->options.tz_utc);
+ fat_time_unix2fat(sbi, &inode->i_mtime, &raw_entry->time,
+ &raw_entry->date, NULL);
if (sbi->options.isvfat) {
__le16 atime;
- fat_date_unix2dos(inode->i_ctime.tv_sec, &raw_entry->ctime,
- &raw_entry->cdate, sbi->options.tz_utc);
- fat_date_unix2dos(inode->i_atime.tv_sec, &atime,
- &raw_entry->adate, sbi->options.tz_utc);
- raw_entry->ctime_cs = (inode->i_ctime.tv_sec & 1) * 100 +
- inode->i_ctime.tv_nsec / 10000000;
+ fat_time_unix2fat(sbi, &inode->i_ctime, &raw_entry->ctime,
+ &raw_entry->cdate, &raw_entry->ctime_cs);
+ fat_time_unix2fat(sbi, &inode->i_atime, &atime,
+ &raw_entry->adate, NULL);
}
spin_unlock(&sbi->inode_hash_lock);
mark_buffer_dirty(bh);
+ err = 0;
if (wait)
err = sync_dirty_buffer(bh);
brelse(bh);
-out:
- unlock_super(sb);
return err;
}
inode = NULL;
}
}
- if (!inode) {
- /* For now, do nothing
- * What we could do is:
- * follow the file starting at fh[4], and record
- * the ".." entry, and the name of the fh[2] entry.
- * The follow the ".." file finding the next step up.
- * This way we build a path to the root of
- * the tree. If this works, we lookup the path and so
- * get this inode into the cache.
- * Finally try the fat_iget lookup again
- * If that fails, then weare totally out of luck
- * But all that is for another day
- */
- }
- if (!inode)
- return ERR_PTR(-ESTALE);
-
- /* now to find a dentry.
- * If possible, get a well-connected one
+ /*
+ * For now, do nothing if the inode is not found.
+ *
+ * What we could do is:
+ *
+ * - follow the file starting at fh[4], and record the ".." entry,
+ * and the name of the fh[2] entry.
+ * - then follow the ".." file finding the next step up.
+ *
+ * This way we build a path to the root of the tree. If this works, we
+ * lookup the path and so get this inode into the cache. Finally try
+ * the fat_iget lookup again. If that fails, then we are totally out
+ * of luck. But all that is for another day
*/
- result = d_alloc_anon(inode);
- if (result == NULL) {
- iput(inode);
- return ERR_PTR(-ENOMEM);
- }
- result->d_op = sb->s_root->d_op;
+ result = d_obtain_alias(inode);
+ if (!IS_ERR(result))
+ result->d_op = sb->s_root->d_op;
return result;
}
}
inode = fat_build_inode(sb, de, i_pos);
brelse(bh);
- if (IS_ERR(inode)) {
- parent = ERR_CAST(inode);
- goto out;
- }
- parent = d_alloc_anon(inode);
- if (!parent) {
- iput(inode);
- parent = ERR_PTR(-ENOMEM);
- }
+
+ parent = d_obtain_alias(inode);
out:
unlock_super(sb);
Opt_obsolate, Opt_flush, Opt_tz_utc, Opt_err,
};
-static match_table_t fat_tokens = {
+static const match_table_t fat_tokens = {
{Opt_check_r, "check=relaxed"},
{Opt_check_s, "check=strict"},
{Opt_check_n, "check=normal"},
{Opt_tz_utc, "tz=UTC"},
{Opt_err, NULL},
};
-static match_table_t msdos_tokens = {
+static const match_table_t msdos_tokens = {
{Opt_nodots, "nodots"},
{Opt_nodots, "dotsOK=no"},
{Opt_dots, "dots"},
{Opt_dots, "dotsOK=yes"},
{Opt_err, NULL}
};
-static match_table_t vfat_tokens = {
+static const match_table_t vfat_tokens = {
{Opt_charset, "iocharset=%s"},
{Opt_shortname_lower, "shortname=lower"},
{Opt_shortname_win95, "shortname=win95"},
projects / linux-2.6-omap-h63xx.git / blobdiff