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-rw-r--r--fs/fat/fat.h3
-rw-r--r--fs/fat/fatent.c25
-rw-r--r--fs/fat/inode.c19
-rw-r--r--fs/fat/namei_vfat.c27
4 files changed, 51 insertions, 23 deletions
diff --git a/fs/fat/fat.h b/fs/fat/fat.h
index 7db0979c6b72..e6efdfa0f6db 100644
--- a/fs/fat/fat.h
+++ b/fs/fat/fat.h
@@ -44,7 +44,8 @@ struct fat_mount_options {
nocase:1, /* Does this need case conversion? 0=need case conversion*/
usefree:1, /* Use free_clusters for FAT32 */
tz_utc:1, /* Filesystem timestamps are in UTC */
- rodir:1; /* allow ATTR_RO for directory */
+ rodir:1, /* allow ATTR_RO for directory */
+ discard:1; /* Issue discard requests on deletions */
};
#define FAT_HASH_BITS 8
diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c
index a81037721a6f..81184d3b75a3 100644
--- a/fs/fat/fatent.c
+++ b/fs/fat/fatent.c
@@ -566,16 +566,21 @@ int fat_free_clusters(struct inode *inode, int cluster)
goto error;
}
- /*
- * Issue discard for the sectors we no longer care about,
- * batching contiguous clusters into one request
- */
- if (cluster != fatent.entry + 1) {
- int nr_clus = fatent.entry - first_cl + 1;
-
- sb_issue_discard(sb, fat_clus_to_blknr(sbi, first_cl),
- nr_clus * sbi->sec_per_clus);
- first_cl = cluster;
+ if (sbi->options.discard) {
+ /*
+ * Issue discard for the sectors we no longer
+ * care about, batching contiguous clusters
+ * into one request
+ */
+ if (cluster != fatent.entry + 1) {
+ int nr_clus = fatent.entry - first_cl + 1;
+
+ sb_issue_discard(sb,
+ fat_clus_to_blknr(sbi, first_cl),
+ nr_clus * sbi->sec_per_clus);
+
+ first_cl = cluster;
+ }
}
ops->ent_put(&fatent, FAT_ENT_FREE);
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 76b7961ab663..0ce143bd7d56 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -558,7 +558,7 @@ static int fat_statfs(struct dentry *dentry, struct kstatfs *buf)
buf->f_bavail = sbi->free_clusters;
buf->f_fsid.val[0] = (u32)id;
buf->f_fsid.val[1] = (u32)(id >> 32);
- buf->f_namelen = sbi->options.isvfat ? 260 : 12;
+ buf->f_namelen = sbi->options.isvfat ? FAT_LFN_LEN : 12;
return 0;
}
@@ -577,7 +577,7 @@ static inline loff_t fat_i_pos_read(struct msdos_sb_info *sbi,
return i_pos;
}
-static int fat_write_inode(struct inode *inode, int wait)
+static int __fat_write_inode(struct inode *inode, int wait)
{
struct super_block *sb = inode->i_sb;
struct msdos_sb_info *sbi = MSDOS_SB(sb);
@@ -634,9 +634,14 @@ retry:
return err;
}
+static int fat_write_inode(struct inode *inode, struct writeback_control *wbc)
+{
+ return __fat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
+}
+
int fat_sync_inode(struct inode *inode)
{
- return fat_write_inode(inode, 1);
+ return __fat_write_inode(inode, 1);
}
EXPORT_SYMBOL_GPL(fat_sync_inode);
@@ -858,6 +863,8 @@ static int fat_show_options(struct seq_file *m, struct vfsmount *mnt)
seq_puts(m, ",errors=panic");
else
seq_puts(m, ",errors=remount-ro");
+ if (opts->discard)
+ seq_puts(m, ",discard");
return 0;
}
@@ -871,7 +878,7 @@ enum {
Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes,
Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes,
Opt_obsolate, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_cont,
- Opt_err_panic, Opt_err_ro, Opt_err,
+ Opt_err_panic, Opt_err_ro, Opt_discard, Opt_err,
};
static const match_table_t fat_tokens = {
@@ -899,6 +906,7 @@ static const match_table_t fat_tokens = {
{Opt_err_cont, "errors=continue"},
{Opt_err_panic, "errors=panic"},
{Opt_err_ro, "errors=remount-ro"},
+ {Opt_discard, "discard"},
{Opt_obsolate, "conv=binary"},
{Opt_obsolate, "conv=text"},
{Opt_obsolate, "conv=auto"},
@@ -1136,6 +1144,9 @@ static int parse_options(char *options, int is_vfat, int silent, int *debug,
case Opt_rodir:
opts->rodir = 1;
break;
+ case Opt_discard:
+ opts->discard = 1;
+ break;
/* obsolete mount options */
case Opt_obsolate:
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index f565f24019b5..c1ef50154868 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -502,14 +502,14 @@ xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
*outlen = utf8s_to_utf16s(name, len, (wchar_t *)outname);
if (*outlen < 0)
return *outlen;
- else if (*outlen > 255)
+ else if (*outlen > FAT_LFN_LEN)
return -ENAMETOOLONG;
op = &outname[*outlen * sizeof(wchar_t)];
} else {
if (nls) {
for (i = 0, ip = name, op = outname, *outlen = 0;
- i < len && *outlen <= 255;
+ i < len && *outlen <= FAT_LFN_LEN;
*outlen += 1)
{
if (escape && (*ip == ':')) {
@@ -549,7 +549,7 @@ xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
return -ENAMETOOLONG;
} else {
for (i = 0, ip = name, op = outname, *outlen = 0;
- i < len && *outlen <= 255;
+ i < len && *outlen <= FAT_LFN_LEN;
i++, *outlen += 1)
{
*op++ = *ip++;
@@ -701,6 +701,15 @@ static int vfat_find(struct inode *dir, struct qstr *qname,
return fat_search_long(dir, qname->name, len, sinfo);
}
+/*
+ * (nfsd's) anonymous disconnected dentry?
+ * NOTE: !IS_ROOT() is not anonymous (I.e. d_splice_alias() did the job).
+ */
+static int vfat_d_anon_disconn(struct dentry *dentry)
+{
+ return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
+}
+
static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
@@ -729,11 +738,11 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
}
alias = d_find_alias(inode);
- if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) {
+ if (alias && !vfat_d_anon_disconn(alias)) {
/*
- * 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.
+ * This inode has non anonymous-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.
*/
@@ -743,7 +752,9 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
iput(inode);
unlock_super(sb);
return alias;
- }
+ } else
+ dput(alias);
+
out:
unlock_super(sb);
dentry->d_op = sb->s_root->d_op;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-15 08:17:31 +0000