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fs/read_write.c
17.9 KB
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/* * linux/fs/read_write.c * * Copyright (C) 1991, 1992 Linus Torvalds */ #include <linux/slab.h> #include <linux/stat.h> #include <linux/fcntl.h> #include <linux/file.h> #include <linux/uio.h> #include <linux/smp_lock.h> |
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#include <linux/fsnotify.h> |
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#include <linux/security.h> #include <linux/module.h> #include <linux/syscalls.h> |
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#include <linux/pagemap.h> |
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#include <linux/splice.h> |
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#include "read_write.h" |
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#include <asm/uaccess.h> #include <asm/unistd.h> |
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const struct file_operations generic_ro_fops = { |
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.llseek = generic_file_llseek, |
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.read = do_sync_read, .aio_read = generic_file_aio_read, |
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.mmap = generic_file_readonly_mmap, |
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.splice_read = generic_file_splice_read, |
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}; EXPORT_SYMBOL(generic_ro_fops); loff_t generic_file_llseek(struct file *file, loff_t offset, int origin) { long long retval; struct inode *inode = file->f_mapping->host; |
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mutex_lock(&inode->i_mutex); |
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switch (origin) { |
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case SEEK_END: |
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offset += inode->i_size; break; |
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case SEEK_CUR: |
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offset += file->f_pos; } retval = -EINVAL; if (offset>=0 && offset<=inode->i_sb->s_maxbytes) { if (offset != file->f_pos) { file->f_pos = offset; file->f_version = 0; } retval = offset; } |
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mutex_unlock(&inode->i_mutex); |
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return retval; } EXPORT_SYMBOL(generic_file_llseek); loff_t remote_llseek(struct file *file, loff_t offset, int origin) { long long retval; lock_kernel(); switch (origin) { |
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case SEEK_END: |
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offset += i_size_read(file->f_path.dentry->d_inode); |
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break; |
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case SEEK_CUR: |
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offset += file->f_pos; } retval = -EINVAL; |
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if (offset>=0 && offset<=file->f_path.dentry->d_inode->i_sb->s_maxbytes) { |
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if (offset != file->f_pos) { file->f_pos = offset; file->f_version = 0; } retval = offset; } unlock_kernel(); return retval; } EXPORT_SYMBOL(remote_llseek); loff_t no_llseek(struct file *file, loff_t offset, int origin) { return -ESPIPE; } EXPORT_SYMBOL(no_llseek); loff_t default_llseek(struct file *file, loff_t offset, int origin) { long long retval; lock_kernel(); switch (origin) { |
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case SEEK_END: |
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offset += i_size_read(file->f_path.dentry->d_inode); |
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break; |
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case SEEK_CUR: |
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offset += file->f_pos; } retval = -EINVAL; if (offset >= 0) { if (offset != file->f_pos) { file->f_pos = offset; file->f_version = 0; } retval = offset; } unlock_kernel(); return retval; } EXPORT_SYMBOL(default_llseek); loff_t vfs_llseek(struct file *file, loff_t offset, int origin) { loff_t (*fn)(struct file *, loff_t, int); fn = no_llseek; if (file->f_mode & FMODE_LSEEK) { fn = default_llseek; if (file->f_op && file->f_op->llseek) fn = file->f_op->llseek; } return fn(file, offset, origin); } EXPORT_SYMBOL(vfs_llseek); asmlinkage off_t sys_lseek(unsigned int fd, off_t offset, unsigned int origin) { off_t retval; struct file * file; int fput_needed; retval = -EBADF; file = fget_light(fd, &fput_needed); if (!file) goto bad; retval = -EINVAL; |
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if (origin <= SEEK_MAX) { |
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loff_t res = vfs_llseek(file, offset, origin); retval = res; if (res != (loff_t)retval) retval = -EOVERFLOW; /* LFS: should only happen on 32 bit platforms */ } fput_light(file, fput_needed); bad: return retval; } #ifdef __ARCH_WANT_SYS_LLSEEK asmlinkage long sys_llseek(unsigned int fd, unsigned long offset_high, unsigned long offset_low, loff_t __user * result, unsigned int origin) { int retval; struct file * file; loff_t offset; int fput_needed; retval = -EBADF; file = fget_light(fd, &fput_needed); if (!file) goto bad; retval = -EINVAL; |
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if (origin > SEEK_MAX) |
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goto out_putf; offset = vfs_llseek(file, ((loff_t) offset_high << 32) | offset_low, origin); retval = (int)offset; if (offset >= 0) { retval = -EFAULT; if (!copy_to_user(result, &offset, sizeof(offset))) retval = 0; } out_putf: fput_light(file, fput_needed); bad: return retval; } #endif |
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/* * rw_verify_area doesn't like huge counts. We limit * them to something that fits in "int" so that others * won't have to do range checks all the time. */ #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK) |
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int rw_verify_area(int read_write, struct file *file, loff_t *ppos, size_t count) { struct inode *inode; loff_t pos; |
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inode = file->f_path.dentry->d_inode; |
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if (unlikely((ssize_t) count < 0)) |
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goto Einval; pos = *ppos; if (unlikely((pos < 0) || (loff_t) (pos + count) < 0)) goto Einval; |
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if (unlikely(inode->i_flock && mandatory_lock(inode))) { |
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int retval = locks_mandatory_area( read_write == READ ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE, inode, file, pos, count); if (retval < 0) return retval; } return count > MAX_RW_COUNT ? MAX_RW_COUNT : count; |
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Einval: return -EINVAL; } |
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static void wait_on_retry_sync_kiocb(struct kiocb *iocb) { set_current_state(TASK_UNINTERRUPTIBLE); if (!kiocbIsKicked(iocb)) schedule(); else kiocbClearKicked(iocb); __set_current_state(TASK_RUNNING); } |
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ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos) { |
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struct iovec iov = { .iov_base = buf, .iov_len = len }; |
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struct kiocb kiocb; ssize_t ret; init_sync_kiocb(&kiocb, filp); kiocb.ki_pos = *ppos; |
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kiocb.ki_left = len; for (;;) { ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos); if (ret != -EIOCBRETRY) break; |
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wait_on_retry_sync_kiocb(&kiocb); |
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} |
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|
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if (-EIOCBQUEUED == ret) ret = wait_on_sync_kiocb(&kiocb); *ppos = kiocb.ki_pos; return ret; } EXPORT_SYMBOL(do_sync_read); ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) { ssize_t ret; if (!(file->f_mode & FMODE_READ)) return -EBADF; if (!file->f_op || (!file->f_op->read && !file->f_op->aio_read)) return -EINVAL; if (unlikely(!access_ok(VERIFY_WRITE, buf, count))) return -EFAULT; ret = rw_verify_area(READ, file, pos, count); |
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if (ret >= 0) { count = ret; |
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ret = security_file_permission (file, MAY_READ); if (!ret) { if (file->f_op->read) ret = file->f_op->read(file, buf, count, pos); else ret = do_sync_read(file, buf, count, pos); if (ret > 0) { |
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fsnotify_access(file->f_path.dentry); |
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add_rchar(current, ret); |
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} |
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inc_syscr(current); |
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} } return ret; } EXPORT_SYMBOL(vfs_read); ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) { |
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struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len }; |
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struct kiocb kiocb; ssize_t ret; init_sync_kiocb(&kiocb, filp); kiocb.ki_pos = *ppos; |
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kiocb.ki_left = len; for (;;) { ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos); if (ret != -EIOCBRETRY) break; |
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wait_on_retry_sync_kiocb(&kiocb); |
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} |
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if (-EIOCBQUEUED == ret) ret = wait_on_sync_kiocb(&kiocb); *ppos = kiocb.ki_pos; return ret; } EXPORT_SYMBOL(do_sync_write); ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos) { ssize_t ret; if (!(file->f_mode & FMODE_WRITE)) return -EBADF; if (!file->f_op || (!file->f_op->write && !file->f_op->aio_write)) return -EINVAL; if (unlikely(!access_ok(VERIFY_READ, buf, count))) return -EFAULT; ret = rw_verify_area(WRITE, file, pos, count); |
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if (ret >= 0) { count = ret; |
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ret = security_file_permission (file, MAY_WRITE); if (!ret) { if (file->f_op->write) ret = file->f_op->write(file, buf, count, pos); else ret = do_sync_write(file, buf, count, pos); if (ret > 0) { |
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fsnotify_modify(file->f_path.dentry); |
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add_wchar(current, ret); |
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} |
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inc_syscw(current); |
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} } return ret; } EXPORT_SYMBOL(vfs_write); static inline loff_t file_pos_read(struct file *file) { return file->f_pos; } static inline void file_pos_write(struct file *file, loff_t pos) { file->f_pos = pos; } asmlinkage ssize_t sys_read(unsigned int fd, char __user * buf, size_t count) { struct file *file; ssize_t ret = -EBADF; int fput_needed; file = fget_light(fd, &fput_needed); if (file) { loff_t pos = file_pos_read(file); ret = vfs_read(file, buf, count, &pos); file_pos_write(file, pos); fput_light(file, fput_needed); } return ret; } EXPORT_SYMBOL_GPL(sys_read); asmlinkage ssize_t sys_write(unsigned int fd, const char __user * buf, size_t count) { struct file *file; ssize_t ret = -EBADF; int fput_needed; file = fget_light(fd, &fput_needed); if (file) { loff_t pos = file_pos_read(file); ret = vfs_write(file, buf, count, &pos); file_pos_write(file, pos); fput_light(file, fput_needed); } return ret; } asmlinkage ssize_t sys_pread64(unsigned int fd, char __user *buf, size_t count, loff_t pos) { struct file *file; ssize_t ret = -EBADF; int fput_needed; if (pos < 0) return -EINVAL; file = fget_light(fd, &fput_needed); if (file) { ret = -ESPIPE; if (file->f_mode & FMODE_PREAD) ret = vfs_read(file, buf, count, &pos); fput_light(file, fput_needed); } return ret; } asmlinkage ssize_t sys_pwrite64(unsigned int fd, const char __user *buf, size_t count, loff_t pos) { struct file *file; ssize_t ret = -EBADF; int fput_needed; if (pos < 0) return -EINVAL; file = fget_light(fd, &fput_needed); if (file) { ret = -ESPIPE; if (file->f_mode & FMODE_PWRITE) ret = vfs_write(file, buf, count, &pos); fput_light(file, fput_needed); } return ret; } /* * Reduce an iovec's length in-place. Return the resulting number of segments */ unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to) { unsigned long seg = 0; size_t len = 0; while (seg < nr_segs) { seg++; if (len + iov->iov_len >= to) { iov->iov_len = to - len; break; } len += iov->iov_len; iov++; } return seg; } |
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ssize_t do_sync_readv_writev(struct file *filp, const struct iovec *iov, unsigned long nr_segs, size_t len, loff_t *ppos, iov_fn_t fn) { struct kiocb kiocb; ssize_t ret; init_sync_kiocb(&kiocb, filp); kiocb.ki_pos = *ppos; kiocb.ki_left = len; kiocb.ki_nbytes = len; for (;;) { ret = fn(&kiocb, iov, nr_segs, kiocb.ki_pos); if (ret != -EIOCBRETRY) break; wait_on_retry_sync_kiocb(&kiocb); } if (ret == -EIOCBQUEUED) ret = wait_on_sync_kiocb(&kiocb); *ppos = kiocb.ki_pos; return ret; } /* Do it by hand, with file-ops */ ssize_t do_loop_readv_writev(struct file *filp, struct iovec *iov, unsigned long nr_segs, loff_t *ppos, io_fn_t fn) { struct iovec *vector = iov; ssize_t ret = 0; while (nr_segs > 0) { void __user *base; size_t len; ssize_t nr; base = vector->iov_base; len = vector->iov_len; vector++; nr_segs--; nr = fn(filp, base, len, ppos); if (nr < 0) { if (!ret) ret = nr; break; } ret += nr; if (nr != len) break; } return ret; } |
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/* A write operation does a read from user space and vice versa */ #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ) |
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ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, unsigned long nr_segs, unsigned long fast_segs, struct iovec *fast_pointer, struct iovec **ret_pointer) { unsigned long seg; ssize_t ret; struct iovec *iov = fast_pointer; /* * SuS says "The readv() function *may* fail if the iovcnt argument * was less than or equal to 0, or greater than {IOV_MAX}. Linux has * traditionally returned zero for zero segments, so... */ if (nr_segs == 0) { ret = 0; goto out; } /* * First get the "struct iovec" from user memory and * verify all the pointers */ if (nr_segs > UIO_MAXIOV) { ret = -EINVAL; goto out; } if (nr_segs > fast_segs) { iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL); if (iov == NULL) { ret = -ENOMEM; goto out; } } if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) { ret = -EFAULT; goto out; } /* * According to the Single Unix Specification we should return EINVAL * if an element length is < 0 when cast to ssize_t or if the * total length would overflow the ssize_t return value of the * system call. */ ret = 0; for (seg = 0; seg < nr_segs; seg++) { void __user *buf = iov[seg].iov_base; ssize_t len = (ssize_t)iov[seg].iov_len; /* see if we we're about to use an invalid len or if * it's about to overflow ssize_t */ if (len < 0 || (ret + len < ret)) { ret = -EINVAL; goto out; } if (unlikely(!access_ok(vrfy_dir(type), buf, len))) { ret = -EFAULT; goto out; } ret += len; } out: *ret_pointer = iov; return ret; } |
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static ssize_t do_readv_writev(int type, struct file *file, const struct iovec __user * uvector, unsigned long nr_segs, loff_t *pos) { |
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size_t tot_len; struct iovec iovstack[UIO_FASTIOV]; |
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struct iovec *iov = iovstack; |
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ssize_t ret; |
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io_fn_t fn; iov_fn_t fnv; |
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if (!file->f_op) { ret = -EINVAL; |
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goto out; |
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} |
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ret = rw_copy_check_uvector(type, uvector, nr_segs, ARRAY_SIZE(iovstack), iovstack, &iov); if (ret <= 0) |
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goto out; |
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|
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tot_len = ret; |
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ret = rw_verify_area(type, file, pos, tot_len); |
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if (ret < 0) |
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goto out; |
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ret = security_file_permission(file, type == READ ? MAY_READ : MAY_WRITE); if (ret) goto out; |
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fnv = NULL; if (type == READ) { fn = file->f_op->read; |
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fnv = file->f_op->aio_read; |
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} else { fn = (io_fn_t)file->f_op->write; |
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fnv = file->f_op->aio_write; |
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} |
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if (fnv) ret = do_sync_readv_writev(file, iov, nr_segs, tot_len, pos, fnv); else ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn); |
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out: if (iov != iovstack) kfree(iov); |
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if ((ret + (type == READ)) > 0) { if (type == READ) |
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fsnotify_access(file->f_path.dentry); |
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else |
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fsnotify_modify(file->f_path.dentry); |
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} |
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return ret; |
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} ssize_t vfs_readv(struct file *file, const struct iovec __user *vec, unsigned long vlen, loff_t *pos) { if (!(file->f_mode & FMODE_READ)) return -EBADF; |
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if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read)) |
1da177e4c Linux-2.6.12-rc2 |
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return -EINVAL; return do_readv_writev(READ, file, vec, vlen, pos); } EXPORT_SYMBOL(vfs_readv); ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, unsigned long vlen, loff_t *pos) { if (!(file->f_mode & FMODE_WRITE)) return -EBADF; |
ee0b3e671 [PATCH] Remove re... |
642 |
if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write)) |
1da177e4c Linux-2.6.12-rc2 |
643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 |
return -EINVAL; return do_readv_writev(WRITE, file, vec, vlen, pos); } EXPORT_SYMBOL(vfs_writev); asmlinkage ssize_t sys_readv(unsigned long fd, const struct iovec __user *vec, unsigned long vlen) { struct file *file; ssize_t ret = -EBADF; int fput_needed; file = fget_light(fd, &fput_needed); if (file) { loff_t pos = file_pos_read(file); ret = vfs_readv(file, vec, vlen, &pos); file_pos_write(file, pos); fput_light(file, fput_needed); } if (ret > 0) |
4b98d11b4 [PATCH] ifdef ->r... |
666 667 |
add_rchar(current, ret); inc_syscr(current); |
1da177e4c Linux-2.6.12-rc2 |
668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 |
return ret; } asmlinkage ssize_t sys_writev(unsigned long fd, const struct iovec __user *vec, unsigned long vlen) { struct file *file; ssize_t ret = -EBADF; int fput_needed; file = fget_light(fd, &fput_needed); if (file) { loff_t pos = file_pos_read(file); ret = vfs_writev(file, vec, vlen, &pos); file_pos_write(file, pos); fput_light(file, fput_needed); } if (ret > 0) |
4b98d11b4 [PATCH] ifdef ->r... |
687 688 |
add_wchar(current, ret); inc_syscw(current); |
1da177e4c Linux-2.6.12-rc2 |
689 690 691 692 693 694 695 696 697 698 |
return ret; } static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, size_t count, loff_t max) { struct file * in_file, * out_file; struct inode * in_inode, * out_inode; loff_t pos; ssize_t retval; |
534f2aaa6 sys_sendfile: swi... |
699 |
int fput_needed_in, fput_needed_out, fl; |
1da177e4c Linux-2.6.12-rc2 |
700 701 702 703 704 705 706 707 708 709 710 |
/* * Get input file, and verify that it is ok.. */ retval = -EBADF; in_file = fget_light(in_fd, &fput_needed_in); if (!in_file) goto out; if (!(in_file->f_mode & FMODE_READ)) goto fput_in; retval = -EINVAL; |
0f7fc9e4d [PATCH] VFS: chan... |
711 |
in_inode = in_file->f_path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
712 713 |
if (!in_inode) goto fput_in; |
d96e6e716 Remove remnants o... |
714 |
if (!in_file->f_op || !in_file->f_op->splice_read) |
1da177e4c Linux-2.6.12-rc2 |
715 716 717 718 719 720 721 722 |
goto fput_in; retval = -ESPIPE; if (!ppos) ppos = &in_file->f_pos; else if (!(in_file->f_mode & FMODE_PREAD)) goto fput_in; retval = rw_verify_area(READ, in_file, ppos, count); |
e28cc7157 Relax the rw_veri... |
723 |
if (retval < 0) |
1da177e4c Linux-2.6.12-rc2 |
724 |
goto fput_in; |
e28cc7157 Relax the rw_veri... |
725 |
count = retval; |
1da177e4c Linux-2.6.12-rc2 |
726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 |
retval = security_file_permission (in_file, MAY_READ); if (retval) goto fput_in; /* * Get output file, and verify that it is ok.. */ retval = -EBADF; out_file = fget_light(out_fd, &fput_needed_out); if (!out_file) goto fput_in; if (!(out_file->f_mode & FMODE_WRITE)) goto fput_out; retval = -EINVAL; if (!out_file->f_op || !out_file->f_op->sendpage) goto fput_out; |
0f7fc9e4d [PATCH] VFS: chan... |
743 |
out_inode = out_file->f_path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
744 |
retval = rw_verify_area(WRITE, out_file, &out_file->f_pos, count); |
e28cc7157 Relax the rw_veri... |
745 |
if (retval < 0) |
1da177e4c Linux-2.6.12-rc2 |
746 |
goto fput_out; |
e28cc7157 Relax the rw_veri... |
747 |
count = retval; |
1da177e4c Linux-2.6.12-rc2 |
748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 |
retval = security_file_permission (out_file, MAY_WRITE); if (retval) goto fput_out; if (!max) max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes); pos = *ppos; retval = -EINVAL; if (unlikely(pos < 0)) goto fput_out; if (unlikely(pos + count > max)) { retval = -EOVERFLOW; if (pos >= max) goto fput_out; count = max - pos; } |
d96e6e716 Remove remnants o... |
766 |
fl = 0; |
534f2aaa6 sys_sendfile: swi... |
767 |
#if 0 |
d96e6e716 Remove remnants o... |
768 769 770 771 772 773 774 775 |
/* * We need to debate whether we can enable this or not. The * man page documents EAGAIN return for the output at least, * and the application is arguably buggy if it doesn't expect * EAGAIN on a non-blocking file descriptor. */ if (in_file->f_flags & O_NONBLOCK) fl = SPLICE_F_NONBLOCK; |
534f2aaa6 sys_sendfile: swi... |
776 |
#endif |
d96e6e716 Remove remnants o... |
777 |
retval = do_splice_direct(in_file, ppos, out_file, count, fl); |
1da177e4c Linux-2.6.12-rc2 |
778 779 |
if (retval > 0) { |
4b98d11b4 [PATCH] ifdef ->r... |
780 781 |
add_rchar(current, retval); add_wchar(current, retval); |
1da177e4c Linux-2.6.12-rc2 |
782 |
} |
1da177e4c Linux-2.6.12-rc2 |
783 |
|
4b98d11b4 [PATCH] ifdef ->r... |
784 785 |
inc_syscr(current); inc_syscw(current); |
1da177e4c Linux-2.6.12-rc2 |
786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 |
if (*ppos > max) retval = -EOVERFLOW; fput_out: fput_light(out_file, fput_needed_out); fput_in: fput_light(in_file, fput_needed_in); out: return retval; } asmlinkage ssize_t sys_sendfile(int out_fd, int in_fd, off_t __user *offset, size_t count) { loff_t pos; off_t off; ssize_t ret; if (offset) { if (unlikely(get_user(off, offset))) return -EFAULT; pos = off; ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS); if (unlikely(put_user(pos, offset))) return -EFAULT; return ret; } return do_sendfile(out_fd, in_fd, NULL, count, 0); } asmlinkage ssize_t sys_sendfile64(int out_fd, int in_fd, loff_t __user *offset, size_t count) { loff_t pos; ssize_t ret; if (offset) { if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t)))) return -EFAULT; ret = do_sendfile(out_fd, in_fd, &pos, count, 0); if (unlikely(put_user(pos, offset))) return -EFAULT; return ret; } return do_sendfile(out_fd, in_fd, NULL, count, 0); } |