*/
#include <linux/module.h>
-
#include <linux/jiffies.h>
-#include <linux/msdos_fs.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include <linux/namei.h>
+#include "fat.h"
-static int vfat_revalidate(struct dentry *dentry, struct nameidata *nd)
+/*
+ * If new entry was created in the parent, it could create the 8.3
+ * alias (the shortname of logname). So, the parent may have the
+ * negative-dentry which matches the created 8.3 alias.
+ *
+ * If it happened, the negative dentry isn't actually negative
+ * anymore. So, drop it.
+ */
+static int vfat_revalidate_shortname(struct dentry *dentry)
{
int ret = 1;
-
- if (!dentry->d_inode &&
- nd && !(nd->flags & LOOKUP_CONTINUE) && (nd->flags & LOOKUP_CREATE))
- /*
- * negative dentry is dropped, in order to make sure
- * to use the name which a user desires if this is
- * create path.
- */
+ spin_lock(&dentry->d_lock);
+ if (dentry->d_time != dentry->d_parent->d_inode->i_version)
ret = 0;
- else {
- spin_lock(&dentry->d_lock);
- if (dentry->d_time != dentry->d_parent->d_inode->i_version)
- ret = 0;
- spin_unlock(&dentry->d_lock);
- }
+ spin_unlock(&dentry->d_lock);
return ret;
}
+static int vfat_revalidate(struct dentry *dentry, struct nameidata *nd)
+{
+ /* This is not negative dentry. Always valid. */
+ if (dentry->d_inode)
+ return 1;
+ return vfat_revalidate_shortname(dentry);
+}
+
+static int vfat_revalidate_ci(struct dentry *dentry, struct nameidata *nd)
+{
+ /*
+ * This is not negative dentry. Always valid.
+ *
+ * Note, rename() to existing directory entry will have ->d_inode,
+ * and will use existing name which isn't specified name by user.
+ *
+ * We may be able to drop this positive dentry here. But dropping
+ * positive dentry isn't good idea. So it's unsupported like
+ * rename("filename", "FILENAME") for now.
+ */
+ if (dentry->d_inode)
+ return 1;
+
+ /*
+ * This may be nfsd (or something), anyway, we can't see the
+ * intent of this. So, since this can be for creation, drop it.
+ */
+ if (!nd)
+ return 0;
+
+ /*
+ * Drop the negative dentry, in order to make sure to use the
+ * case sensitive name which is specified by user if this is
+ * for creation.
+ */
+ if (!(nd->flags & (LOOKUP_CONTINUE | LOOKUP_PARENT))) {
+ if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
+ return 0;
+ }
+
+ return vfat_revalidate_shortname(dentry);
+}
+
/* returns the length of a struct qstr, ignoring trailing dots */
static unsigned int vfat_striptail_len(struct qstr *qstr)
{
return 1;
}
-static struct dentry_operations vfat_dentry_ops[4] = {
- {
- .d_hash = vfat_hashi,
- .d_compare = vfat_cmpi,
- },
- {
- .d_revalidate = vfat_revalidate,
- .d_hash = vfat_hashi,
- .d_compare = vfat_cmpi,
- },
- {
- .d_hash = vfat_hash,
- .d_compare = vfat_cmp,
- },
- {
- .d_revalidate = vfat_revalidate,
- .d_hash = vfat_hash,
- .d_compare = vfat_cmp,
- }
+static struct dentry_operations vfat_ci_dentry_ops = {
+ .d_revalidate = vfat_revalidate_ci,
+ .d_hash = vfat_hashi,
+ .d_compare = vfat_cmpi,
+};
+
+static struct dentry_operations vfat_dentry_ops = {
+ .d_revalidate = vfat_revalidate,
+ .d_hash = vfat_hash,
+ .d_compare = vfat_cmp,
};
/* Characters that are undesirable in an MS-DOS file name */
unsigned char msdos_name[MSDOS_NAME];
wchar_t *uname;
__le16 time, date;
+ u8 time_cs;
int err, ulen, usize, i;
loff_t offset;
memcpy(de->name, msdos_name, MSDOS_NAME);
de->attr = is_dir ? ATTR_DIR : ATTR_ARCH;
de->lcase = lcase;
- fat_date_unix2dos(ts->tv_sec, &time, &date, sbi->options.tz_utc);
+ fat_time_unix2fat(sbi, ts, &time, &date, &time_cs);
de->time = de->ctime = time;
de->date = de->cdate = de->adate = date;
- de->ctime_cs = 0;
+ de->ctime_cs = time_cs;
de->start = cpu_to_le16(cluster);
de->starthi = cpu_to_le16(cluster >> 16);
de->size = 0;
{
struct super_block *sb = dir->i_sb;
struct fat_slot_info sinfo;
- struct inode *inode = NULL;
+ struct inode *inode;
struct dentry *alias;
- int err, table;
+ int err;
lock_super(sb);
- table = (MSDOS_SB(sb)->options.name_check == 's') ? 2 : 0;
- dentry->d_op = &vfat_dentry_ops[table];
err = vfat_find(dir, &dentry->d_name, &sinfo);
if (err) {
- table++;
+ if (err == -ENOENT) {
+ inode = NULL;
+ goto out;
+ }
goto error;
}
+
inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
brelse(sinfo.bh);
if (IS_ERR(inode)) {
- unlock_super(sb);
- return ERR_CAST(inode);
+ err = PTR_ERR(inode);
+ goto error;
}
- alias = d_find_alias(inode);
- if (alias) {
- if (d_invalidate(alias) == 0)
- dput(alias);
- else {
- iput(inode);
- unlock_super(sb);
- return alias;
- }
+ alias = d_find_alias(inode);
+ if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) {
+ /*
+ * This inode has non DCACHE_DISCONNECTED dentry. This
+ * means, the user did ->lookup() by an another name
+ * (longname vs 8.3 alias of it) in past.
+ *
+ * Switch to new one for reason of locality if possible.
+ */
+ BUG_ON(d_unhashed(alias));
+ if (!S_ISDIR(inode->i_mode))
+ d_move(alias, dentry);
+ iput(inode);
+ unlock_super(sb);
+ return alias;
}
-error:
+out:
unlock_super(sb);
- dentry->d_op = &vfat_dentry_ops[table];
+ dentry->d_op = sb->s_root->d_op;
dentry->d_time = dentry->d_parent->d_inode->i_version;
dentry = d_splice_alias(inode, dentry);
if (dentry) {
- dentry->d_op = &vfat_dentry_ops[table];
+ dentry->d_op = sb->s_root->d_op;
dentry->d_time = dentry->d_parent->d_inode->i_version;
}
return dentry;
+
+error:
+ unlock_super(sb);
+ return ERR_PTR(err);
}
static int vfat_create(struct inode *dir, struct dentry *dentry, int mode,
return res;
if (MSDOS_SB(sb)->options.name_check != 's')
- sb->s_root->d_op = &vfat_dentry_ops[0];
+ sb->s_root->d_op = &vfat_ci_dentry_ops;
else
- sb->s_root->d_op = &vfat_dentry_ops[2];
+ sb->s_root->d_op = &vfat_dentry_ops;
return 0;
}
git.openpandora.org / pandora-kernel.git / blobdiff