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[dfsv2] add dfs pwrite pread

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geniusgogo 2024-04-10 10:26:58 +08:00 committed by GitHub
parent d08ae0bfd1
commit 651f23a604
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GPG Key ID: B5690EEEBB952194
3 changed files with 126 additions and 12 deletions
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2
components/dfs/dfs_v2/include/dfs_file.h
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@ -151,7 +151,9 @@ int dfs_file_close(struct dfs_file *file);
off_t dfs_file_get_fpos(struct dfs_file *file); off_t dfs_file_get_fpos(struct dfs_file *file);
void dfs_file_set_fpos(struct dfs_file *file, off_t fpos); void dfs_file_set_fpos(struct dfs_file *file, off_t fpos);
ssize_t dfs_file_pread(struct dfs_file *file, void *buf, size_t len, off_t offset);
ssize_t dfs_file_read(struct dfs_file *file, void *buf, size_t len); ssize_t dfs_file_read(struct dfs_file *file, void *buf, size_t len);
ssize_t dfs_file_pwrite(struct dfs_file *file, const void *buf, size_t len, off_t offset);
ssize_t dfs_file_write(struct dfs_file *file, const void *buf, size_t len); ssize_t dfs_file_write(struct dfs_file *file, const void *buf, size_t len);
off_t generic_dfs_lseek(struct dfs_file *file, off_t offset, int whence); off_t generic_dfs_lseek(struct dfs_file *file, off_t offset, int whence);
off_t dfs_file_lseek(struct dfs_file *file, off_t offset, int wherece); off_t dfs_file_lseek(struct dfs_file *file, off_t offset, int wherece);

128
components/dfs/dfs_v2/src/dfs_file.c
View File

@ -626,6 +626,54 @@ int dfs_file_close(struct dfs_file *file)
return ret; return ret;
} }
ssize_t dfs_file_pread(struct dfs_file *file, void *buf, size_t len, off_t offset)
{
ssize_t ret = -EBADF;
if (file)
{
/* check whether read */
if (!(dfs_fflags(file->flags) & DFS_F_FREAD))
{
ret = -EPERM;
}
else if (!file->fops || !file->fops->read)
{
ret = -ENOSYS;
}
else if (file->vnode && file->vnode->type != FT_DIRECTORY)
{
off_t pos = offset;
ret = rw_verify_area(file, &pos, len);
if (ret > 0)
{
len = ret;
if (dfs_is_mounted(file->vnode->mnt) == 0)
{
#ifdef RT_USING_PAGECACHE
if (file->vnode->aspace && !(file->flags & O_DIRECT))
{
ret = dfs_aspace_read(file, buf, len, &pos);
}
else
#endif
{
ret = file->fops->read(file, buf, len, &pos);
}
}
else
{
ret = -EINVAL;
}
}
}
}
return ret;
}
ssize_t dfs_file_read(struct dfs_file *file, void *buf, size_t len) ssize_t dfs_file_read(struct dfs_file *file, void *buf, size_t len)
{ {
ssize_t ret = -EBADF; ssize_t ret = -EBADF;
@ -677,9 +725,9 @@ ssize_t dfs_file_read(struct dfs_file *file, void *buf, size_t len)
return ret; return ret;
} }
ssize_t dfs_file_write(struct dfs_file *file, const void *buf, size_t len) ssize_t dfs_file_pwrite(struct dfs_file *file, const void *buf, size_t len, off_t offset)
{ {
size_t ret = -EBADF; ssize_t ret = -EBADF;
if (file) if (file)
{ {
@ -695,8 +743,7 @@ ssize_t dfs_file_write(struct dfs_file *file, const void *buf, size_t len)
} }
else if (file->vnode && file->vnode->type != FT_DIRECTORY) else if (file->vnode && file->vnode->type != FT_DIRECTORY)
{ {
/* fpos lock */ off_t pos = offset;
off_t pos = dfs_file_get_fpos(file);
ret = rw_verify_area(file, &pos, len); ret = rw_verify_area(file, &pos, len);
if (ret > 0) if (ret > 0)
@ -728,8 +775,77 @@ ssize_t dfs_file_write(struct dfs_file *file, const void *buf, size_t len)
ret = -EINVAL; ret = -EINVAL;
} }
} }
/* fpos unlock */ }
dfs_file_set_fpos(file, pos); }
return ret;
}
ssize_t dfs_file_write(struct dfs_file *file, const void *buf, size_t len)
{
ssize_t ret = -EBADF;
if (file)
{
if (!(dfs_fflags(file->flags) & DFS_F_FWRITE))
{
LOG_W("bad write flags.");
ret = -EBADF;
}
else if (!file->fops || !file->fops->write)
{
LOG_W("no fops write.");
ret = -ENOSYS;
}
else if (file->vnode && file->vnode->type != FT_DIRECTORY)
{
off_t pos;
if (!(file->flags & O_APPEND))
{
/* fpos lock */
pos = dfs_file_get_fpos(file);
}
else
{
pos = file->vnode->size;
}
ret = rw_verify_area(file, &pos, len);
if (ret > 0)
{
len = ret;
DLOG(msg, "dfs_file", file->dentry->mnt->fs_ops->name, DLOG_MSG,
"dfs_file_write(fd, buf, %d)", len);
if (dfs_is_mounted(file->vnode->mnt) == 0)
{
#ifdef RT_USING_PAGECACHE
if (file->vnode->aspace && !(file->flags & O_DIRECT))
{
ret = dfs_aspace_write(file, buf, len, &pos);
}
else
#endif
{
ret = file->fops->write(file, buf, len, &pos);
}
if (file->flags & O_SYNC)
{
file->fops->flush(file);
}
}
else
{
ret = -EINVAL;
}
}
if (!(file->flags & O_APPEND))
{
/* fpos unlock */
dfs_file_set_fpos(file, pos);
}
} }
} }

8
components/dfs/dfs_v2/src/dfs_posix.c
View File

@ -1363,9 +1363,7 @@ ssize_t pread(int fd, void *buf, size_t len, off_t offset)
/* fpos lock */ /* fpos lock */
fpos = dfs_file_get_fpos(file); fpos = dfs_file_get_fpos(file);
dfs_file_lseek(file, offset, SEEK_SET); result = dfs_file_pread(file, buf, len, offset);
result = dfs_file_read(file, buf, len);
dfs_file_lseek(file, fpos, SEEK_SET);
/* fpos unlock */ /* fpos unlock */
dfs_file_set_fpos(file, fpos); dfs_file_set_fpos(file, fpos);
if (result < 0) if (result < 0)
@ -1411,9 +1409,7 @@ ssize_t pwrite(int fd, const void *buf, size_t len, off_t offset)
} }
/* fpos lock */ /* fpos lock */
fpos = dfs_file_get_fpos(file); fpos = dfs_file_get_fpos(file);
dfs_file_lseek(file, offset, SEEK_SET); result = dfs_file_pwrite(file, buf, len, offset);
result = dfs_file_write(file, buf, len);
dfs_file_lseek(file, fpos, SEEK_SET);
/* fpos unlock */ /* fpos unlock */
dfs_file_set_fpos(file, fpos); dfs_file_set_fpos(file, fpos);
if (result < 0) if (result < 0)