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author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-14 18:13:32 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-14 18:13:32 -0700 |
commit | 581bfce969cbfc7ce43ee92273be9cb7c3fdfa61 (patch) | |
tree | 0a693778ce39c49b9b7d93d0d6795c576896f5cf /fs/read_write.c | |
parent | cc73fee0bae2d66594d1fa2df92bbd783aa98e04 (diff) | |
parent | 9725d4cef62229b4ec4c912e0db0761e7d400650 (diff) | |
download | linux-581bfce969cbfc7ce43ee92273be9cb7c3fdfa61.tar.gz linux-581bfce969cbfc7ce43ee92273be9cb7c3fdfa61.tar.bz2 linux-581bfce969cbfc7ce43ee92273be9cb7c3fdfa61.zip |
Merge branch 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull more set_fs removal from Al Viro:
"Christoph's 'use kernel_read and friends rather than open-coding
set_fs()' series"
* 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
fs: unexport vfs_readv and vfs_writev
fs: unexport vfs_read and vfs_write
fs: unexport __vfs_read/__vfs_write
lustre: switch to kernel_write
gadget/f_mass_storage: stop messing with the address limit
mconsole: switch to kernel_read
btrfs: switch write_buf to kernel_write
net/9p: switch p9_fd_read to kernel_write
mm/nommu: switch do_mmap_private to kernel_read
serial2002: switch serial2002_tty_write to kernel_{read/write}
fs: make the buf argument to __kernel_write a void pointer
fs: fix kernel_write prototype
fs: fix kernel_read prototype
fs: move kernel_read to fs/read_write.c
fs: move kernel_write to fs/read_write.c
autofs4: switch autofs4_write to __kernel_write
ashmem: switch to ->read_iter
Diffstat (limited to 'fs/read_write.c')
-rw-r--r-- | fs/read_write.c | 43 |
1 files changed, 32 insertions, 11 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index 61b58c7b6531..a2b9a47235c5 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -413,7 +413,20 @@ ssize_t __vfs_read(struct file *file, char __user *buf, size_t count, else return -EINVAL; } -EXPORT_SYMBOL(__vfs_read); + +ssize_t kernel_read(struct file *file, void *buf, size_t count, loff_t *pos) +{ + mm_segment_t old_fs; + ssize_t result; + + old_fs = get_fs(); + set_fs(get_ds()); + /* The cast to a user pointer is valid due to the set_fs() */ + result = vfs_read(file, (void __user *)buf, count, pos); + set_fs(old_fs); + return result; +} +EXPORT_SYMBOL(kernel_read); ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) { @@ -441,8 +454,6 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) return ret; } -EXPORT_SYMBOL(vfs_read); - static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) { struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len }; @@ -471,9 +482,8 @@ ssize_t __vfs_write(struct file *file, const char __user *p, size_t count, else return -EINVAL; } -EXPORT_SYMBOL(__vfs_write); -ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos) +ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t *pos) { mm_segment_t old_fs; const char __user *p; @@ -496,9 +506,24 @@ ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t inc_syscw(current); return ret; } - EXPORT_SYMBOL(__kernel_write); +ssize_t kernel_write(struct file *file, const void *buf, size_t count, + loff_t *pos) +{ + mm_segment_t old_fs; + ssize_t res; + + old_fs = get_fs(); + set_fs(get_ds()); + /* The cast to a user pointer is valid due to the set_fs() */ + res = vfs_write(file, (__force const char __user *)buf, count, pos); + set_fs(old_fs); + + return res; +} +EXPORT_SYMBOL(kernel_write); + ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos) { ssize_t ret; @@ -527,8 +552,6 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_ return ret; } -EXPORT_SYMBOL(vfs_write); - static inline loff_t file_pos_read(struct file *file) { return file->f_pos; @@ -959,9 +982,8 @@ ssize_t vfs_readv(struct file *file, const struct iovec __user *vec, return ret; } -EXPORT_SYMBOL(vfs_readv); -ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, +static ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, unsigned long vlen, loff_t *pos, rwf_t flags) { struct iovec iovstack[UIO_FASTIOV]; @@ -978,7 +1000,6 @@ ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, } return ret; } -EXPORT_SYMBOL(vfs_writev); static ssize_t do_readv(unsigned long fd, const struct iovec __user *vec, unsigned long vlen, rwf_t flags) |