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Thu, 27 Jul 2023 17:28:51 +0000 From: Gabriel Krisman Bertazi To: viro@zeniv.linux.org.uk, brauner@kernel.org, tytso@mit.edu, ebiggers@kernel.org, jaegeuk@kernel.org Date: Thu, 27 Jul 2023 13:28:38 -0400 Message-ID: <20230727172843.20542-3-krisman@suse.de> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230727172843.20542-1-krisman@suse.de> References: <20230727172843.20542-1-krisman@suse.de> MIME-Version: 1.0 X-Headers-End: 1qP4nN-004oJn-7l Subject: [f2fs-dev] [PATCH v4 2/7] fs: Add DCACHE_CASEFOLDED_NAME flag X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fsdevel@vger.kernel.org, Gabriel Krisman Bertazi , linux-ext4@vger.kernel.org, Gabriel Krisman Bertazi , linux-f2fs-devel@lists.sourceforge.net Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net From: Gabriel Krisman Bertazi 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 Signed-off-by: Gabriel Krisman Bertazi --- 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); + 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;