| Message ID | 20230727172843.20542-3-krisman@suse.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Support negative dentries on case-insensitive ext4 and f2fs | expand |
On Thu, Jul 27, 2023 at 01:28:38PM -0400, Gabriel Krisman Bertazi wrote: > From: Gabriel Krisman Bertazi <krisman@collabora.com> > > This flag marks a negative or positive dentry as being created after a > case-insensitive lookup operation. It is useful to differentiate > dentries this way to detect whether the negative dentry can be trusted > during a case-insensitive lookup. > > Reviewed-by: Theodore Ts'o <tytso@mit.edu> > Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com> > > --- > Changes since v2: > - Rename DCACHE_CASEFOLD_LOOKUP -> DCACHE_CASEFOLDED_NAME (Eric) > --- > fs/dcache.c | 8 ++++++++ > include/linux/dcache.h | 8 ++++++++ > 2 files changed, 16 insertions(+) > > diff --git a/fs/dcache.c b/fs/dcache.c > index 98521862e58a..5791489b589f 100644 > --- a/fs/dcache.c > +++ b/fs/dcache.c > @@ -1958,6 +1958,14 @@ void d_set_fallthru(struct dentry *dentry) > } > EXPORT_SYMBOL(d_set_fallthru); > > +void d_set_casefold_lookup(struct dentry *dentry) > +{ > + spin_lock(&dentry->d_lock); > + dentry->d_flags |= DCACHE_CASEFOLDED_NAME; > + spin_unlock(&dentry->d_lock); > +} > +EXPORT_SYMBOL(d_set_casefold_lookup); d_set_casefolded_name() > +static inline bool d_is_casefold_lookup(const struct dentry *dentry) > +{ > + return dentry->d_flags & DCACHE_CASEFOLDED_NAME; > +} d_is_casefolded_name(). Or even better, just write 'dentry->d_flags & DCACHE_CASEFOLDED_NAME' directly in the one place that actually needs this? - Eric
diff --git a/fs/dcache.c b/fs/dcache.c index 98521862e58a..5791489b589f 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -1958,6 +1958,14 @@ void d_set_fallthru(struct dentry *dentry) } EXPORT_SYMBOL(d_set_fallthru); +void d_set_casefold_lookup(struct dentry *dentry) +{ + spin_lock(&dentry->d_lock); + dentry->d_flags |= DCACHE_CASEFOLDED_NAME; + spin_unlock(&dentry->d_lock); +} +EXPORT_SYMBOL(d_set_casefold_lookup); + static unsigned d_flags_for_inode(struct inode *inode) { unsigned add_flags = DCACHE_REGULAR_TYPE; diff --git a/include/linux/dcache.h b/include/linux/dcache.h index b6188f2e8950..14aa0255bd04 100644 --- a/include/linux/dcache.h +++ b/include/linux/dcache.h @@ -209,6 +209,7 @@ struct dentry_operations { #define DCACHE_FALLTHRU 0x01000000 /* Fall through to lower layer */ #define DCACHE_NOKEY_NAME 0x02000000 /* Encrypted name encoded without key */ #define DCACHE_OP_REAL 0x04000000 +#define DCACHE_CASEFOLDED_NAME 0x08000000 /* Dentry comes from a casefold directory */ #define DCACHE_PAR_LOOKUP 0x10000000 /* being looked up (with parent locked shared) */ #define DCACHE_DENTRY_CURSOR 0x20000000 @@ -497,6 +498,13 @@ static inline bool d_is_fallthru(const struct dentry *dentry) return dentry->d_flags & DCACHE_FALLTHRU; } +extern void d_set_casefold_lookup(struct dentry *dentry); + +static inline bool d_is_casefold_lookup(const struct dentry *dentry) +{ + return dentry->d_flags & DCACHE_CASEFOLDED_NAME; +} + extern int sysctl_vfs_cache_pressure;