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| author | Eric W. Biederman <ebiederm@xmission.com> | 2020-11-20 17:14:27 -0600 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2020-12-10 12:40:07 -0600 |
| commit | 460b4f812a9d473d4b39d87d37844f9fc30a9eb3 (patch) | |
| tree | ab069d7f2f83820de3f091de2757a0e86b2af866 | |
| parent | f36c2943274199cb8aef32ac96531ffb7c4b43d0 (diff) | |
| download | linux-460b4f812a9d473d4b39d87d37844f9fc30a9eb3.tar.gz | |
file: Rename fcheck lookup_fd_rcu
Also remove the confusing comment about checking if a fd exists. I
could not find one instance in the entire kernel that still matches
the description or the reason for the name fcheck.
The need for better names became apparent in the last round of
discussion of this set of changes[1].
[1] https://lkml.kernel.org/r/CAHk-=wj8BQbgJFLa+J0e=iT-1qpmCRTbPAJ8gd6MJQ=kbRPqyQ@mail.gmail.com
Link: https://lkml.kernel.org/r/20201120231441.29911-10-ebiederm@xmission.com
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
| -rw-r--r-- | Documentation/filesystems/files.rst | 6 | ||||
| -rw-r--r-- | arch/powerpc/platforms/cell/spufs/coredump.c | 2 | ||||
| -rw-r--r-- | fs/notify/dnotify/dnotify.c | 2 | ||||
| -rw-r--r-- | include/linux/fdtable.h | 8 |
4 files changed, 9 insertions, 9 deletions
diff --git a/Documentation/filesystems/files.rst b/Documentation/filesystems/files.rst index ea75acdb632c04..bcf84459917f50 100644 --- a/Documentation/filesystems/files.rst +++ b/Documentation/filesystems/files.rst @@ -62,7 +62,7 @@ the fdtable structure - be held. 4. To look up the file structure given an fd, a reader - must use either fcheck() or files_lookup_fd_rcu() APIs. These + must use either lookup_fd_rcu() or files_lookup_fd_rcu() APIs. These take care of barrier requirements due to lock-free lookup. An example:: @@ -70,7 +70,7 @@ the fdtable structure - struct file *file; rcu_read_lock(); - file = fcheck(fd); + file = lookup_fd_rcu(fd); if (file) { ... } @@ -104,7 +104,7 @@ the fdtable structure - lock-free, they must be installed using rcu_assign_pointer() API. If they are looked up lock-free, rcu_dereference() must be used. However it is advisable to use files_fdtable() - and fcheck()/files_lookup_fd_rcu() which take care of these issues. + and lookup_fd_rcu()/files_lookup_fd_rcu() which take care of these issues. 7. While updating, the fdtable pointer must be looked up while holding files->file_lock. If ->file_lock is dropped, then diff --git a/arch/powerpc/platforms/cell/spufs/coredump.c b/arch/powerpc/platforms/cell/spufs/coredump.c index 026c181a98c5d3..60b5583e9eafcc 100644 --- a/arch/powerpc/platforms/cell/spufs/coredump.c +++ b/arch/powerpc/platforms/cell/spufs/coredump.c @@ -74,7 +74,7 @@ static struct spu_context *coredump_next_context(int *fd) *fd = n - 1; rcu_read_lock(); - file = fcheck(*fd); + file = lookup_fd_rcu(*fd); ctx = SPUFS_I(file_inode(file))->i_ctx; get_spu_context(ctx); rcu_read_unlock(); diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c index 5dcda8f20c04f9..5486aaca60b08a 100644 --- a/fs/notify/dnotify/dnotify.c +++ b/fs/notify/dnotify/dnotify.c @@ -327,7 +327,7 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg) } rcu_read_lock(); - f = fcheck(fd); + f = lookup_fd_rcu(fd); rcu_read_unlock(); /* if (f != filp) means that we lost a race and another task/thread diff --git a/include/linux/fdtable.h b/include/linux/fdtable.h index fa8c402a77901d..2a4a8fed536ecc 100644 --- a/include/linux/fdtable.h +++ b/include/linux/fdtable.h @@ -105,10 +105,10 @@ static inline struct file *files_lookup_fd_rcu(struct files_struct *files, unsig return files_lookup_fd_raw(files, fd); } -/* - * Check whether the specified fd has an open file. - */ -#define fcheck(fd) files_lookup_fd_rcu(current->files, fd) +static inline struct file *lookup_fd_rcu(unsigned int fd) +{ + return files_lookup_fd_rcu(current->files, fd); +} struct task_struct; |