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| author | Jürg Billeter <j@bitron.ch> | 2017-09-29 14:07:17 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2018-01-25 19:32:55 -0500 |
| commit | e1fc742e14e01d84d9693c4aca4ab23da65811fb (patch) | |
| tree | 5f6aa92ad10ebd83a667d246b17c8fb4e3cb8f4e | |
| parent | c981f254cc82f50f8cb864ce6432097b23195b9c (diff) | |
| download | linux-stable-e1fc742e14e01d84d9693c4aca4ab23da65811fb.tar.gz linux-stable-e1fc742e14e01d84d9693c4aca4ab23da65811fb.tar.bz2 linux-stable-e1fc742e14e01d84d9693c4aca4ab23da65811fb.zip | |
fs: add RWF_APPEND
This is the per-I/O equivalent of O_APPEND to support atomic append
operations on any open file.
If a file is opened with O_APPEND, pwrite() ignores the offset and
always appends data to the end of the file. RWF_APPEND enables atomic
append and pwrite() with offset on a single file descriptor.
Signed-off-by: Jürg Billeter <j@bitron.ch>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | include/linux/fs.h | 2 | ||||
| -rw-r--r-- | include/uapi/linux/fs.h | 6 |
2 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 6276f8315e5b..85c8ddc55760 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3224,6 +3224,8 @@ static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags) ki->ki_flags |= IOCB_DSYNC; if (flags & RWF_SYNC) ki->ki_flags |= (IOCB_DSYNC | IOCB_SYNC); + if (flags & RWF_APPEND) + ki->ki_flags |= IOCB_APPEND; return 0; } diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h index 4199f8acbce5..d2a8313fabd7 100644 --- a/include/uapi/linux/fs.h +++ b/include/uapi/linux/fs.h @@ -377,7 +377,11 @@ typedef int __bitwise __kernel_rwf_t; /* per-IO, return -EAGAIN if operation would block */ #define RWF_NOWAIT ((__force __kernel_rwf_t)0x00000008) +/* per-IO O_APPEND */ +#define RWF_APPEND ((__force __kernel_rwf_t)0x00000010) + /* mask of flags supported by the kernel */ -#define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT) +#define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT |\ + RWF_APPEND) #endif /* _UAPI_LINUX_FS_H */ |